diff --git a/src/openrct2/actions/BalloonPressAction.hpp b/src/openrct2/actions/BalloonPressAction.hpp
index 7b1252f445..b6f78595a5 100644
--- a/src/openrct2/actions/BalloonPressAction.hpp
+++ b/src/openrct2/actions/BalloonPressAction.hpp
@@ -14,7 +14,7 @@
 
 DEFINE_GAME_ACTION(BalloonPressAction, GAME_COMMAND_BALLOON_PRESS, GameActionResult)
 {
-    uint16_t _spriteIndex = SPRITE_INDEX_NULL;
+    uint16_t _spriteIndex{ SPRITE_INDEX_NULL };
 
 public:
     BalloonPressAction() = default;
diff --git a/src/openrct2/actions/BannerPlaceAction.hpp b/src/openrct2/actions/BannerPlaceAction.hpp
index 88e04546ef..ec8846b159 100644
--- a/src/openrct2/actions/BannerPlaceAction.hpp
+++ b/src/openrct2/actions/BannerPlaceAction.hpp
@@ -21,7 +21,7 @@ private:
     CoordsXYZD _loc;
     ObjectEntryIndex _bannerType{ BANNER_NULL };
     BannerIndex _bannerIndex{ BANNER_INDEX_NULL };
-    uint8_t _primaryColour;
+    uint8_t _primaryColour{};
 
 public:
     BannerPlaceAction() = default;
diff --git a/src/openrct2/actions/BannerSetColourAction.hpp b/src/openrct2/actions/BannerSetColourAction.hpp
index fc0413642c..56fd04bc44 100644
--- a/src/openrct2/actions/BannerSetColourAction.hpp
+++ b/src/openrct2/actions/BannerSetColourAction.hpp
@@ -19,7 +19,7 @@ DEFINE_GAME_ACTION(BannerSetColourAction, GAME_COMMAND_SET_BANNER_COLOUR, GameAc
 {
 private:
     CoordsXYZD _loc;
-    uint8_t _primaryColour;
+    uint8_t _primaryColour{};
 
 public:
     BannerSetColourAction() = default;
diff --git a/src/openrct2/actions/BannerSetNameAction.hpp b/src/openrct2/actions/BannerSetNameAction.hpp
index 1fd0d8d7fc..61eded35a9 100644
--- a/src/openrct2/actions/BannerSetNameAction.hpp
+++ b/src/openrct2/actions/BannerSetNameAction.hpp
@@ -23,7 +23,7 @@
 DEFINE_GAME_ACTION(BannerSetNameAction, GAME_COMMAND_SET_BANNER_NAME, GameActionResult)
 {
 private:
-    BannerIndex _bannerIndex;
+    BannerIndex _bannerIndex{ BANNER_INDEX_NULL };
     std::string _name;
 
 public:
diff --git a/src/openrct2/actions/BannerSetStyleAction.hpp b/src/openrct2/actions/BannerSetStyleAction.hpp
index d3a005cf47..03f9da4ef2 100644
--- a/src/openrct2/actions/BannerSetStyleAction.hpp
+++ b/src/openrct2/actions/BannerSetStyleAction.hpp
@@ -11,6 +11,7 @@
 
 #include "../Context.h"
 #include "../management/Finance.h"
+#include "../util/Util.h"
 #include "../windows/Intent.h"
 #include "../world/Banner.h"
 #include "GameAction.h"
@@ -28,9 +29,9 @@ enum class BannerSetStyleType : uint8_t
 DEFINE_GAME_ACTION(BannerSetStyleAction, GAME_COMMAND_SET_BANNER_STYLE, GameActionResult)
 {
 private:
-    uint8_t _type = static_cast<uint8_t>(BannerSetStyleType::Count);
-    BannerIndex _bannerIndex = BANNER_INDEX_NULL;
-    uint8_t _parameter;
+    uint8_t _type = EnumValue(BannerSetStyleType::Count);
+    BannerIndex _bannerIndex{ BANNER_INDEX_NULL };
+    uint8_t _parameter{};
 
 public:
     BannerSetStyleAction() = default;
diff --git a/src/openrct2/actions/ClearAction.hpp b/src/openrct2/actions/ClearAction.hpp
index 30bdd42017..784a19cd9e 100644
--- a/src/openrct2/actions/ClearAction.hpp
+++ b/src/openrct2/actions/ClearAction.hpp
@@ -40,7 +40,7 @@ DEFINE_GAME_ACTION(ClearAction, GAME_COMMAND_CLEAR_SCENERY, GameActionResult)
 {
 private:
     MapRange _range;
-    ClearableItems _itemsToClear;
+    ClearableItems _itemsToClear{};
 
 public:
     ClearAction() = default;
diff --git a/src/openrct2/actions/ClimateSetAction.hpp b/src/openrct2/actions/ClimateSetAction.hpp
index 94a5892524..396f2ee68f 100644
--- a/src/openrct2/actions/ClimateSetAction.hpp
+++ b/src/openrct2/actions/ClimateSetAction.hpp
@@ -15,7 +15,7 @@
 DEFINE_GAME_ACTION(ClimateSetAction, GAME_COMMAND_SET_CLIMATE, GameActionResult)
 {
 private:
-    uint8_t _climate;
+    uint8_t _climate{};
 
 public:
     ClimateSetAction() = default;
diff --git a/src/openrct2/actions/FootpathPlaceAction.hpp b/src/openrct2/actions/FootpathPlaceAction.hpp
index f328b1091d..d6eec39a60 100644
--- a/src/openrct2/actions/FootpathPlaceAction.hpp
+++ b/src/openrct2/actions/FootpathPlaceAction.hpp
@@ -27,9 +27,9 @@ DEFINE_GAME_ACTION(FootpathPlaceAction, GAME_COMMAND_PLACE_PATH, GameActionResul
 {
 private:
     CoordsXYZ _loc;
-    uint8_t _slope;
-    ObjectEntryIndex _type;
-    Direction _direction = INVALID_DIRECTION;
+    uint8_t _slope{};
+    ObjectEntryIndex _type{};
+    Direction _direction{ INVALID_DIRECTION };
 
 public:
     FootpathPlaceAction() = default;
diff --git a/src/openrct2/actions/FootpathPlaceFromTrackAction.hpp b/src/openrct2/actions/FootpathPlaceFromTrackAction.hpp
index e9233f8162..45ed9b7351 100644
--- a/src/openrct2/actions/FootpathPlaceFromTrackAction.hpp
+++ b/src/openrct2/actions/FootpathPlaceFromTrackAction.hpp
@@ -26,9 +26,9 @@ DEFINE_GAME_ACTION(FootpathPlaceFromTrackAction, GAME_COMMAND_PLACE_PATH_FROM_TR
 {
 private:
     CoordsXYZ _loc;
-    uint8_t _slope;
-    ObjectEntryIndex _type;
-    uint8_t _edges;
+    uint8_t _slope{};
+    ObjectEntryIndex _type{};
+    uint8_t _edges{};
 
 public:
     FootpathPlaceFromTrackAction() = default;
diff --git a/src/openrct2/actions/FootpathSceneryPlaceAction.hpp b/src/openrct2/actions/FootpathSceneryPlaceAction.hpp
index 80971c8d03..4daf63adf5 100644
--- a/src/openrct2/actions/FootpathSceneryPlaceAction.hpp
+++ b/src/openrct2/actions/FootpathSceneryPlaceAction.hpp
@@ -26,7 +26,7 @@ DEFINE_GAME_ACTION(FootpathSceneryPlaceAction, GAME_COMMAND_PLACE_FOOTPATH_SCENE
 {
 private:
     CoordsXYZ _loc;
-    ObjectEntryIndex _pathItemType;
+    ObjectEntryIndex _pathItemType{};
 
 public:
     FootpathSceneryPlaceAction() = default;
diff --git a/src/openrct2/actions/GuestSetFlagsAction.hpp b/src/openrct2/actions/GuestSetFlagsAction.hpp
index c892a5bc80..30b7332f4a 100644
--- a/src/openrct2/actions/GuestSetFlagsAction.hpp
+++ b/src/openrct2/actions/GuestSetFlagsAction.hpp
@@ -17,8 +17,8 @@
 DEFINE_GAME_ACTION(GuestSetFlagsAction, GAME_COMMAND_GUEST_SET_FLAGS, GameActionResult)
 {
 private:
-    uint16_t _peepId = SPRITE_INDEX_NULL;
-    uint32_t _newFlags = 0;
+    uint16_t _peepId{ SPRITE_INDEX_NULL };
+    uint32_t _newFlags{};
 
 public:
     GuestSetFlagsAction() = default;
diff --git a/src/openrct2/actions/GuestSetNameAction.hpp b/src/openrct2/actions/GuestSetNameAction.hpp
index 6bafd8524a..71086cb357 100644
--- a/src/openrct2/actions/GuestSetNameAction.hpp
+++ b/src/openrct2/actions/GuestSetNameAction.hpp
@@ -24,7 +24,7 @@
 DEFINE_GAME_ACTION(GuestSetNameAction, GAME_COMMAND_SET_GUEST_NAME, GameActionResult)
 {
 private:
-    uint16_t _spriteIndex;
+    uint16_t _spriteIndex{ SPRITE_INDEX_NULL };
     std::string _name;
 
 public:
diff --git a/src/openrct2/actions/LandBuyRightsAction.hpp b/src/openrct2/actions/LandBuyRightsAction.hpp
index 17054286a8..ebd75436c7 100644
--- a/src/openrct2/actions/LandBuyRightsAction.hpp
+++ b/src/openrct2/actions/LandBuyRightsAction.hpp
@@ -18,6 +18,7 @@
 #include "../localisation/StringIds.h"
 #include "../management/Finance.h"
 #include "../ride/RideData.h"
+#include "../util/Util.h"
 #include "../windows/Intent.h"
 #include "../world/Park.h"
 #include "../world/Scenery.h"
@@ -36,7 +37,7 @@ DEFINE_GAME_ACTION(LandBuyRightsAction, GAME_COMMAND_BUY_LAND_RIGHTS, GameAction
 {
 private:
     MapRange _range;
-    uint8_t _setting = static_cast<uint8_t>(LandBuyRightSetting::Count);
+    uint8_t _setting{ EnumValue(LandBuyRightSetting::Count) };
 
     constexpr static rct_string_id _ErrorTitles[] = { STR_CANT_BUY_LAND, STR_CANT_BUY_CONSTRUCTION_RIGHTS_HERE };
 
diff --git a/src/openrct2/actions/LandLowerAction.hpp b/src/openrct2/actions/LandLowerAction.hpp
index fd495b86c0..f4310b50d8 100644
--- a/src/openrct2/actions/LandLowerAction.hpp
+++ b/src/openrct2/actions/LandLowerAction.hpp
@@ -30,7 +30,7 @@ DEFINE_GAME_ACTION(LandLowerAction, GAME_COMMAND_LOWER_LAND, GameActionResult)
 private:
     CoordsXY _coords;
     MapRange _range;
-    uint8_t _selectionType;
+    uint8_t _selectionType{};
 
 public:
     LandLowerAction() = default;
diff --git a/src/openrct2/actions/LandRaiseAction.hpp b/src/openrct2/actions/LandRaiseAction.hpp
index b07f01bf0f..8b39c37d69 100644
--- a/src/openrct2/actions/LandRaiseAction.hpp
+++ b/src/openrct2/actions/LandRaiseAction.hpp
@@ -31,7 +31,7 @@ DEFINE_GAME_ACTION(LandRaiseAction, GAME_COMMAND_RAISE_LAND, GameActionResult)
 private:
     CoordsXY _coords;
     MapRange _range;
-    uint8_t _selectionType;
+    uint8_t _selectionType{};
 
 public:
     LandRaiseAction() = default;
diff --git a/src/openrct2/actions/LandSetHeightAction.hpp b/src/openrct2/actions/LandSetHeightAction.hpp
index e5ed50eaa9..6d2c1eb711 100644
--- a/src/openrct2/actions/LandSetHeightAction.hpp
+++ b/src/openrct2/actions/LandSetHeightAction.hpp
@@ -28,8 +28,8 @@ DEFINE_GAME_ACTION(LandSetHeightAction, GAME_COMMAND_SET_LAND_HEIGHT, GameAction
 {
 private:
     CoordsXY _coords;
-    uint8_t _height;
-    uint8_t _style;
+    uint8_t _height{};
+    uint8_t _style{};
 
 public:
     LandSetHeightAction() = default;
diff --git a/src/openrct2/actions/LandSetRightsAction.hpp b/src/openrct2/actions/LandSetRightsAction.hpp
index ff1e5cee1a..049d91f4ad 100644
--- a/src/openrct2/actions/LandSetRightsAction.hpp
+++ b/src/openrct2/actions/LandSetRightsAction.hpp
@@ -18,6 +18,7 @@
 #include "../localisation/StringIds.h"
 #include "../management/Finance.h"
 #include "../ride/RideData.h"
+#include "../util/Util.h"
 #include "../windows/Intent.h"
 #include "../world/Park.h"
 #include "../world/Scenery.h"
@@ -39,8 +40,8 @@ DEFINE_GAME_ACTION(LandSetRightsAction, GAME_COMMAND_SET_LAND_OWNERSHIP, GameAct
 {
 private:
     MapRange _range;
-    uint8_t _setting = static_cast<uint8_t>(LandSetRightSetting::Count);
-    uint8_t _ownership = 0;
+    uint8_t _setting{ EnumValue(LandSetRightSetting::Count) };
+    uint8_t _ownership{};
 
 public:
     LandSetRightsAction() = default;
diff --git a/src/openrct2/actions/LandSmoothAction.hpp b/src/openrct2/actions/LandSmoothAction.hpp
index c55a711ce3..7e872d1f02 100644
--- a/src/openrct2/actions/LandSmoothAction.hpp
+++ b/src/openrct2/actions/LandSmoothAction.hpp
@@ -32,8 +32,8 @@ DEFINE_GAME_ACTION(LandSmoothAction, GAME_COMMAND_EDIT_LAND_SMOOTH, GameActionRe
 private:
     CoordsXY _coords;
     MapRange _range;
-    uint8_t _selectionType{ 0 };
-    bool _isLowering{ false };
+    uint8_t _selectionType{};
+    bool _isLowering{};
 
     constexpr static rct_string_id _ErrorTitles[] = { STR_CANT_LOWER_LAND_HERE, STR_CANT_RAISE_LAND_HERE };
 
diff --git a/src/openrct2/actions/LargeSceneryPlaceAction.hpp b/src/openrct2/actions/LargeSceneryPlaceAction.hpp
index caaa4f6e70..13b1391282 100644
--- a/src/openrct2/actions/LargeSceneryPlaceAction.hpp
+++ b/src/openrct2/actions/LargeSceneryPlaceAction.hpp
@@ -49,8 +49,8 @@ DEFINE_GAME_ACTION(LargeSceneryPlaceAction, GAME_COMMAND_PLACE_LARGE_SCENERY, La
 private:
     CoordsXYZD _loc;
     ObjectEntryIndex _sceneryType{ OBJECT_ENTRY_INDEX_NULL };
-    uint8_t _primaryColour;
-    uint8_t _secondaryColour;
+    uint8_t _primaryColour{};
+    uint8_t _secondaryColour{};
     BannerIndex _bannerId{ BANNER_INDEX_NULL };
 
 public:
diff --git a/src/openrct2/actions/LargeSceneryRemoveAction.hpp b/src/openrct2/actions/LargeSceneryRemoveAction.hpp
index 4c4035b3fd..a3daa0b930 100644
--- a/src/openrct2/actions/LargeSceneryRemoveAction.hpp
+++ b/src/openrct2/actions/LargeSceneryRemoveAction.hpp
@@ -27,7 +27,7 @@ DEFINE_GAME_ACTION(LargeSceneryRemoveAction, GAME_COMMAND_REMOVE_LARGE_SCENERY,
 {
 private:
     CoordsXYZD _loc;
-    uint16_t _tileIndex;
+    uint16_t _tileIndex{};
 
 public:
     LargeSceneryRemoveAction() = default;
diff --git a/src/openrct2/actions/LargeScenerySetColourAction.hpp b/src/openrct2/actions/LargeScenerySetColourAction.hpp
index b6b08b8507..1fc800228c 100644
--- a/src/openrct2/actions/LargeScenerySetColourAction.hpp
+++ b/src/openrct2/actions/LargeScenerySetColourAction.hpp
@@ -18,9 +18,9 @@ DEFINE_GAME_ACTION(LargeScenerySetColourAction, GAME_COMMAND_SET_LARGE_SCENERY_C
 {
 private:
     CoordsXYZD _loc;
-    uint8_t _tileIndex;
-    uint8_t _primaryColour;
-    uint8_t _secondaryColour;
+    uint8_t _tileIndex{};
+    uint8_t _primaryColour{};
+    uint8_t _secondaryColour{};
 
 public:
     LargeScenerySetColourAction() = default;
diff --git a/src/openrct2/actions/LoadOrQuitAction.hpp b/src/openrct2/actions/LoadOrQuitAction.hpp
index 5ef5ead8d6..9e9e867b6e 100644
--- a/src/openrct2/actions/LoadOrQuitAction.hpp
+++ b/src/openrct2/actions/LoadOrQuitAction.hpp
@@ -1,4 +1,4 @@
-/*****************************************************************************
+/*****************************************************************************
  * Copyright (c) 2014-2020 OpenRCT2 developers
  *
  * For a complete list of all authors, please refer to contributors.md
@@ -22,7 +22,7 @@ enum class LoadOrQuitModes : uint8_t
 DEFINE_GAME_ACTION(LoadOrQuitAction, GAME_COMMAND_LOAD_OR_QUIT, GameActionResult)
 {
 private:
-    uint8_t _mode{ 0 };
+    uint8_t _mode{};
     PromptMode _savePromptMode{ PromptMode::SaveBeforeLoad };
 
 public:
diff --git a/src/openrct2/actions/MazePlaceTrackAction.hpp b/src/openrct2/actions/MazePlaceTrackAction.hpp
index 424dafe8dc..6fd7095299 100644
--- a/src/openrct2/actions/MazePlaceTrackAction.hpp
+++ b/src/openrct2/actions/MazePlaceTrackAction.hpp
@@ -18,7 +18,7 @@ DEFINE_GAME_ACTION(MazePlaceTrackAction, GAME_COMMAND_PLACE_MAZE_DESIGN, GameAct
 private:
     CoordsXYZ _loc;
     NetworkRideId_t _rideIndex{ RIDE_ID_NULL };
-    uint16_t _mazeEntry{ 0 };
+    uint16_t _mazeEntry{};
 
 public:
     MazePlaceTrackAction() = default;
diff --git a/src/openrct2/actions/MazeSetTrackAction.hpp b/src/openrct2/actions/MazeSetTrackAction.hpp
index 90894c6499..cf5541240c 100644
--- a/src/openrct2/actions/MazeSetTrackAction.hpp
+++ b/src/openrct2/actions/MazeSetTrackAction.hpp
@@ -51,9 +51,9 @@ DEFINE_GAME_ACTION(MazeSetTrackAction, GAME_COMMAND_SET_MAZE_TRACK, GameActionRe
 {
 private:
     CoordsXYZD _loc;
-    bool _initialPlacement;
-    NetworkRideId_t _rideIndex;
-    uint8_t _mode;
+    bool _initialPlacement{};
+    NetworkRideId_t _rideIndex{ RIDE_ID_NULL };
+    uint8_t _mode{};
 
 public:
     MazeSetTrackAction() = default;
diff --git a/src/openrct2/actions/NetworkModifyGroupAction.hpp b/src/openrct2/actions/NetworkModifyGroupAction.hpp
index 6a7023c85f..aecad1c669 100644
--- a/src/openrct2/actions/NetworkModifyGroupAction.hpp
+++ b/src/openrct2/actions/NetworkModifyGroupAction.hpp
@@ -10,6 +10,7 @@
 #pragma once
 
 #include "../network/network.h"
+#include "../util/Util.h"
 #include "GameAction.h"
 
 enum class ModifyGroupType : uint8_t
@@ -33,11 +34,11 @@ enum class PermissionState : uint8_t
 DEFINE_GAME_ACTION(NetworkModifyGroupAction, GAME_COMMAND_MODIFY_GROUPS, GameActionResult)
 {
 private:
-    uint8_t _type{ static_cast<uint8_t>(ModifyGroupType::Count) };
+    uint8_t _type{ EnumValue(ModifyGroupType::Count) };
     uint8_t _groupId{ std::numeric_limits<uint8_t>::max() };
     std::string _name;
     uint32_t _permissionIndex{ std::numeric_limits<uint32_t>::max() };
-    uint8_t _permissionState{ static_cast<uint8_t>(PermissionState::Count) };
+    uint8_t _permissionState{ EnumValue(PermissionState::Count) };
 
 public:
     NetworkModifyGroupAction() = default;
diff --git a/src/openrct2/actions/ParkMarketingAction.hpp b/src/openrct2/actions/ParkMarketingAction.hpp
index 011dc6739e..e0e41b2e23 100644
--- a/src/openrct2/actions/ParkMarketingAction.hpp
+++ b/src/openrct2/actions/ParkMarketingAction.hpp
@@ -25,9 +25,9 @@
 DEFINE_GAME_ACTION(ParkMarketingAction, GAME_COMMAND_START_MARKETING_CAMPAIGN, GameActionResult)
 {
 private:
-    int32_t _type;
-    int32_t _item;
-    int32_t _numWeeks;
+    int32_t _type{};
+    int32_t _item{};
+    int32_t _numWeeks{};
 
 public:
     ParkMarketingAction() = default;
diff --git a/src/openrct2/actions/ParkSetDateAction.hpp b/src/openrct2/actions/ParkSetDateAction.hpp
index f49accbcb0..ce26bbebfe 100644
--- a/src/openrct2/actions/ParkSetDateAction.hpp
+++ b/src/openrct2/actions/ParkSetDateAction.hpp
@@ -21,9 +21,9 @@
 DEFINE_GAME_ACTION(ParkSetDateAction, GAME_COMMAND_SET_DATE, GameActionResult)
 {
 private:
-    int32_t _year = 0;
-    int32_t _month = 0;
-    int32_t _day = 0;
+    int32_t _year{};
+    int32_t _month{};
+    int32_t _day{};
 
 public:
     ParkSetDateAction() = default;
diff --git a/src/openrct2/actions/ParkSetLoanAction.hpp b/src/openrct2/actions/ParkSetLoanAction.hpp
index a1b85ea0f5..55a45c5563 100644
--- a/src/openrct2/actions/ParkSetLoanAction.hpp
+++ b/src/openrct2/actions/ParkSetLoanAction.hpp
@@ -21,7 +21,7 @@
 DEFINE_GAME_ACTION(ParkSetLoanAction, GAME_COMMAND_SET_CURRENT_LOAN, GameActionResult)
 {
 private:
-    money32 _value;
+    money32 _value{ MONEY32_UNDEFINED };
 
 public:
     ParkSetLoanAction() = default;
diff --git a/src/openrct2/actions/ParkSetParameterAction.hpp b/src/openrct2/actions/ParkSetParameterAction.hpp
index 2c0b1c2142..db2caeb927 100644
--- a/src/openrct2/actions/ParkSetParameterAction.hpp
+++ b/src/openrct2/actions/ParkSetParameterAction.hpp
@@ -11,6 +11,7 @@
 
 #include "../interface/Window.h"
 #include "../ride/ShopItem.h"
+#include "../util/Util.h"
 #include "../world/Park.h"
 #include "GameAction.h"
 
@@ -25,8 +26,8 @@ enum class ParkParameter : uint8_t
 DEFINE_GAME_ACTION(ParkSetParameterAction, GAME_COMMAND_SET_PARK_OPEN, GameActionResult)
 {
 private:
-    uint8_t _parameter{ static_cast<uint8_t>(ParkParameter::Count) };
-    uint64_t _value;
+    uint8_t _parameter{ EnumValue(ParkParameter::Count) };
+    uint64_t _value{};
 
     constexpr static rct_string_id _ErrorTitles[] = { STR_CANT_CLOSE_PARK, STR_CANT_OPEN_PARK, STR_NONE, STR_NONE };
 
diff --git a/src/openrct2/actions/ParkSetResearchFundingAction.hpp b/src/openrct2/actions/ParkSetResearchFundingAction.hpp
index 08e2c33ecf..0654867585 100644
--- a/src/openrct2/actions/ParkSetResearchFundingAction.hpp
+++ b/src/openrct2/actions/ParkSetResearchFundingAction.hpp
@@ -22,8 +22,8 @@ DEFINE_GAME_ACTION(ParkSetResearchFundingAction, GAME_COMMAND_SET_RESEARCH_FUNDI
 {
 private:
     // TODO change to std::optional when C++17
-    uint32_t _priorities;
-    uint8_t _fundingAmount;
+    uint32_t _priorities{};
+    uint8_t _fundingAmount{};
 
 public:
     ParkSetResearchFundingAction() = default;
diff --git a/src/openrct2/actions/PeepPickupAction.hpp b/src/openrct2/actions/PeepPickupAction.hpp
index fe8f439411..3b96af6e6b 100644
--- a/src/openrct2/actions/PeepPickupAction.hpp
+++ b/src/openrct2/actions/PeepPickupAction.hpp
@@ -11,6 +11,7 @@
 
 #include "../Input.h"
 #include "../network/network.h"
+#include "../util/Util.h"
 #include "../world/Sprite.h"
 #include "GameAction.h"
 
@@ -25,10 +26,10 @@ enum class PeepPickupType : uint8_t
 DEFINE_GAME_ACTION(PeepPickupAction, GAME_COMMAND_PICKUP_GUEST, GameActionResult)
 {
 private:
-    uint8_t _type = static_cast<uint8_t>(PeepPickupType::Count);
-    uint32_t _spriteId = SPRITE_INDEX_NULL;
+    uint8_t _type{ EnumValue(PeepPickupType::Count) };
+    uint32_t _spriteId{ SPRITE_INDEX_NULL };
     CoordsXYZ _loc;
-    NetworkPlayerId_t _owner = { -1 };
+    NetworkPlayerId_t _owner{ -1 };
 
 public:
     PeepPickupAction() = default;
diff --git a/src/openrct2/actions/RideDemolishAction.hpp b/src/openrct2/actions/RideDemolishAction.hpp
index 6ceff79c09..b687a81574 100644
--- a/src/openrct2/actions/RideDemolishAction.hpp
+++ b/src/openrct2/actions/RideDemolishAction.hpp
@@ -33,7 +33,7 @@ DEFINE_GAME_ACTION(RideDemolishAction, GAME_COMMAND_DEMOLISH_RIDE, GameActionRes
 {
 private:
     NetworkRideId_t _rideIndex{ RideIdNewNull };
-    uint8_t _modifyType = RIDE_MODIFY_DEMOLISH;
+    uint8_t _modifyType{ RIDE_MODIFY_DEMOLISH };
 
 public:
     RideDemolishAction() = default;
diff --git a/src/openrct2/actions/RideEntranceExitPlaceAction.hpp b/src/openrct2/actions/RideEntranceExitPlaceAction.hpp
index 0667425bdb..c690729085 100644
--- a/src/openrct2/actions/RideEntranceExitPlaceAction.hpp
+++ b/src/openrct2/actions/RideEntranceExitPlaceAction.hpp
@@ -22,10 +22,10 @@ DEFINE_GAME_ACTION(RideEntranceExitPlaceAction, GAME_COMMAND_PLACE_RIDE_ENTRANCE
 {
 private:
     CoordsXY _loc;
-    Direction _direction;
-    NetworkRideId_t _rideIndex;
-    StationIndex _stationNum;
-    bool _isExit;
+    Direction _direction{ INVALID_DIRECTION };
+    NetworkRideId_t _rideIndex{ RIDE_ID_NULL };
+    StationIndex _stationNum{ STATION_INDEX_NULL };
+    bool _isExit{};
 
 public:
     RideEntranceExitPlaceAction() = default;
diff --git a/src/openrct2/actions/RideEntranceExitRemoveAction.hpp b/src/openrct2/actions/RideEntranceExitRemoveAction.hpp
index ec8ffee017..1f52864bb0 100644
--- a/src/openrct2/actions/RideEntranceExitRemoveAction.hpp
+++ b/src/openrct2/actions/RideEntranceExitRemoveAction.hpp
@@ -18,9 +18,9 @@ DEFINE_GAME_ACTION(RideEntranceExitRemoveAction, GAME_COMMAND_REMOVE_RIDE_ENTRAN
 {
 private:
     CoordsXY _loc;
-    NetworkRideId_t _rideIndex;
-    StationIndex _stationNum;
-    bool _isExit;
+    NetworkRideId_t _rideIndex{ RIDE_ID_NULL };
+    StationIndex _stationNum{ STATION_INDEX_NULL };
+    bool _isExit{};
 
 public:
     RideEntranceExitRemoveAction() = default;
diff --git a/src/openrct2/actions/RideSetAppearanceAction.hpp b/src/openrct2/actions/RideSetAppearanceAction.hpp
index a7cf0ce1c5..e73ef7d92b 100644
--- a/src/openrct2/actions/RideSetAppearanceAction.hpp
+++ b/src/openrct2/actions/RideSetAppearanceAction.hpp
@@ -39,9 +39,9 @@ DEFINE_GAME_ACTION(RideSetAppearanceAction, GAME_COMMAND_SET_RIDE_APPEARANCE, Ga
 {
 private:
     NetworkRideId_t _rideIndex{ RideIdNewNull };
-    uint8_t _type;
-    uint8_t _value;
-    uint32_t _index;
+    uint8_t _type{};
+    uint8_t _value{};
+    uint32_t _index{};
 
 public:
     RideSetAppearanceAction() = default;
diff --git a/src/openrct2/actions/RideSetColourScheme.hpp b/src/openrct2/actions/RideSetColourScheme.hpp
index 21233738ef..5e950d9554 100644
--- a/src/openrct2/actions/RideSetColourScheme.hpp
+++ b/src/openrct2/actions/RideSetColourScheme.hpp
@@ -24,9 +24,9 @@
 DEFINE_GAME_ACTION(RideSetColourSchemeAction, GAME_COMMAND_SET_COLOUR_SCHEME, GameActionResult)
 {
 private:
-    CoordsXYZD _loc{ 0, 0, 0, 0 };
-    int32_t _trackType = 0;
-    uint16_t _newColourScheme = 0;
+    CoordsXYZD _loc;
+    int32_t _trackType{};
+    uint16_t _newColourScheme{};
 
 public:
     RideSetColourSchemeAction() = default;
diff --git a/src/openrct2/actions/RideSetPriceAction.hpp b/src/openrct2/actions/RideSetPriceAction.hpp
index 9eafe96b34..85549e721a 100644
--- a/src/openrct2/actions/RideSetPriceAction.hpp
+++ b/src/openrct2/actions/RideSetPriceAction.hpp
@@ -27,8 +27,8 @@ DEFINE_GAME_ACTION(RideSetPriceAction, GAME_COMMAND_SET_RIDE_PRICE, GameActionRe
 {
 private:
     NetworkRideId_t _rideIndex{ RideIdNewNull };
-    money16 _price = MONEY16_UNDEFINED;
-    bool _primaryPrice = true;
+    money16 _price{ MONEY16_UNDEFINED };
+    bool _primaryPrice{ true };
 
 public:
     RideSetPriceAction() = default;
diff --git a/src/openrct2/actions/RideSetSetting.hpp b/src/openrct2/actions/RideSetSetting.hpp
index ee136d2358..c6dcdd7ec2 100644
--- a/src/openrct2/actions/RideSetSetting.hpp
+++ b/src/openrct2/actions/RideSetSetting.hpp
@@ -32,8 +32,8 @@ DEFINE_GAME_ACTION(RideSetSettingAction, GAME_COMMAND_SET_RIDE_SETTING, GameActi
 {
 private:
     NetworkRideId_t _rideIndex{ RideIdNewNull };
-    RideSetSetting _setting{ 0 };
-    uint8_t _value{ 0 };
+    RideSetSetting _setting{};
+    uint8_t _value{};
 
 public:
     RideSetSettingAction() = default;
diff --git a/src/openrct2/actions/RideSetStatus.hpp b/src/openrct2/actions/RideSetStatus.hpp
index 70ac8c25bf..c0c796637c 100644
--- a/src/openrct2/actions/RideSetStatus.hpp
+++ b/src/openrct2/actions/RideSetStatus.hpp
@@ -34,7 +34,7 @@ DEFINE_GAME_ACTION(RideSetStatusAction, GAME_COMMAND_SET_RIDE_STATUS, GameAction
 {
 private:
     NetworkRideId_t _rideIndex{ RideIdNewNull };
-    uint8_t _status = RIDE_STATUS_CLOSED;
+    uint8_t _status{ RIDE_STATUS_CLOSED };
 
 public:
     RideSetStatusAction() = default;
diff --git a/src/openrct2/actions/RideSetVehiclesAction.hpp b/src/openrct2/actions/RideSetVehiclesAction.hpp
index de6ddbce14..acd5b15411 100644
--- a/src/openrct2/actions/RideSetVehiclesAction.hpp
+++ b/src/openrct2/actions/RideSetVehiclesAction.hpp
@@ -36,9 +36,9 @@ DEFINE_GAME_ACTION(RideSetVehicleAction, GAME_COMMAND_SET_RIDE_VEHICLES, GameAct
 {
 private:
     NetworkRideId_t _rideIndex{ RideIdNewNull };
-    uint8_t _type;
-    uint8_t _value;
-    uint8_t _colour;
+    uint8_t _type{};
+    uint8_t _value{};
+    uint8_t _colour{};
 
     constexpr static rct_string_id SetVehicleTypeErrorTitle[] = { STR_RIDE_SET_VEHICLE_SET_NUM_TRAINS_FAIL,
                                                                   STR_RIDE_SET_VEHICLE_SET_NUM_CARS_PER_TRAIN_FAIL,
diff --git a/src/openrct2/actions/ScenarioSetSettingAction.hpp b/src/openrct2/actions/ScenarioSetSettingAction.hpp
index 3edd3325b0..ba1966e4bc 100644
--- a/src/openrct2/actions/ScenarioSetSettingAction.hpp
+++ b/src/openrct2/actions/ScenarioSetSettingAction.hpp
@@ -13,6 +13,7 @@
 #include "../interface/Window.h"
 #include "../management/Finance.h"
 #include "../peep/Peep.h"
+#include "../util/Util.h"
 #include "../world/Park.h"
 #include "GameAction.h"
 
@@ -47,8 +48,8 @@ enum class ScenarioSetSetting : uint8_t
 DEFINE_GAME_ACTION(ScenarioSetSettingAction, GAME_COMMAND_EDIT_SCENARIO_OPTIONS, GameActionResult)
 {
 private:
-    uint8_t _setting{ static_cast<uint8_t>(ScenarioSetSetting::Count) };
-    uint32_t _value{ 0 };
+    uint8_t _setting{ EnumValue(ScenarioSetSetting::Count) };
+    uint32_t _value{};
 
 public:
     ScenarioSetSettingAction() = default;
diff --git a/src/openrct2/actions/SetCheatAction.hpp b/src/openrct2/actions/SetCheatAction.hpp
index 390cf6f8c7..a5497d8ef0 100644
--- a/src/openrct2/actions/SetCheatAction.hpp
+++ b/src/openrct2/actions/SetCheatAction.hpp
@@ -41,9 +41,9 @@ DEFINE_GAME_ACTION(SetCheatAction, GAME_COMMAND_CHEAT, GameActionResult)
     using ParametersRange = std::pair<std::pair<int32_t, int32_t>, std::pair<int32_t, int32_t>>;
 
 private:
-    NetworkCheatType_t _cheatType;
-    int32_t _param1 = 0;
-    int32_t _param2 = 0;
+    NetworkCheatType_t _cheatType{ EnumValue(CheatType::Count) };
+    int32_t _param1{};
+    int32_t _param2{};
 
 public:
     SetCheatAction() = default;
diff --git a/src/openrct2/actions/SetParkEntranceFeeAction.hpp b/src/openrct2/actions/SetParkEntranceFeeAction.hpp
index aac66906e9..38768543b2 100644
--- a/src/openrct2/actions/SetParkEntranceFeeAction.hpp
+++ b/src/openrct2/actions/SetParkEntranceFeeAction.hpp
@@ -19,7 +19,7 @@
 DEFINE_GAME_ACTION(SetParkEntranceFeeAction, GAME_COMMAND_SET_PARK_ENTRANCE_FEE, GameActionResult)
 {
 private:
-    money16 _fee;
+    money16 _fee{ MONEY16_UNDEFINED };
 
 public:
     SetParkEntranceFeeAction() = default;
diff --git a/src/openrct2/actions/SignSetNameAction.hpp b/src/openrct2/actions/SignSetNameAction.hpp
index 4d84a9c2a7..8f49c9011c 100644
--- a/src/openrct2/actions/SignSetNameAction.hpp
+++ b/src/openrct2/actions/SignSetNameAction.hpp
@@ -24,7 +24,7 @@
 DEFINE_GAME_ACTION(SignSetNameAction, GAME_COMMAND_SET_SIGN_NAME, GameActionResult)
 {
 private:
-    BannerIndex _bannerIndex;
+    BannerIndex _bannerIndex{ BANNER_INDEX_NULL };
     std::string _name;
 
 public:
diff --git a/src/openrct2/actions/SignSetStyleAction.hpp b/src/openrct2/actions/SignSetStyleAction.hpp
index 6e020d079e..7abb3c6e55 100644
--- a/src/openrct2/actions/SignSetStyleAction.hpp
+++ b/src/openrct2/actions/SignSetStyleAction.hpp
@@ -23,10 +23,10 @@
 DEFINE_GAME_ACTION(SignSetStyleAction, GAME_COMMAND_SET_SIGN_STYLE, GameActionResult)
 {
 private:
-    BannerIndex _bannerIndex;
-    uint8_t _mainColour;
-    uint8_t _textColour;
-    bool _isLarge;
+    BannerIndex _bannerIndex{ BANNER_INDEX_NULL };
+    uint8_t _mainColour{};
+    uint8_t _textColour{};
+    bool _isLarge{};
 
 public:
     SignSetStyleAction() = default;
diff --git a/src/openrct2/actions/SmallSceneryPlaceAction.hpp b/src/openrct2/actions/SmallSceneryPlaceAction.hpp
index c95e6d1b35..5aeb7389c4 100644
--- a/src/openrct2/actions/SmallSceneryPlaceAction.hpp
+++ b/src/openrct2/actions/SmallSceneryPlaceAction.hpp
@@ -55,10 +55,10 @@ DEFINE_GAME_ACTION(SmallSceneryPlaceAction, GAME_COMMAND_PLACE_SCENERY, SmallSce
 {
 private:
     CoordsXYZD _loc;
-    uint8_t _quadrant;
-    ObjectEntryIndex _sceneryType;
-    uint8_t _primaryColour;
-    uint8_t _secondaryColour;
+    uint8_t _quadrant{};
+    ObjectEntryIndex _sceneryType{};
+    uint8_t _primaryColour{};
+    uint8_t _secondaryColour{};
 
 public:
     SmallSceneryPlaceAction() = default;
diff --git a/src/openrct2/actions/SmallSceneryRemoveAction.hpp b/src/openrct2/actions/SmallSceneryRemoveAction.hpp
index de8fefd607..6c8a213618 100644
--- a/src/openrct2/actions/SmallSceneryRemoveAction.hpp
+++ b/src/openrct2/actions/SmallSceneryRemoveAction.hpp
@@ -27,8 +27,8 @@ DEFINE_GAME_ACTION(SmallSceneryRemoveAction, GAME_COMMAND_REMOVE_SCENERY, GameAc
 {
 private:
     CoordsXYZ _loc;
-    uint8_t _quadrant;
-    ObjectEntryIndex _sceneryType;
+    uint8_t _quadrant{};
+    ObjectEntryIndex _sceneryType{};
 
 public:
     SmallSceneryRemoveAction() = default;
diff --git a/src/openrct2/actions/SmallScenerySetColourAction.hpp b/src/openrct2/actions/SmallScenerySetColourAction.hpp
index 5b60b0e4b4..0c371e9d72 100644
--- a/src/openrct2/actions/SmallScenerySetColourAction.hpp
+++ b/src/openrct2/actions/SmallScenerySetColourAction.hpp
@@ -31,10 +31,10 @@ DEFINE_GAME_ACTION(SmallScenerySetColourAction, GAME_COMMAND_SET_SCENERY_COLOUR,
 {
 private:
     CoordsXYZ _loc;
-    uint8_t _quadrant;
-    ObjectEntryIndex _sceneryType;
-    uint8_t _primaryColour;
-    uint8_t _secondaryColour;
+    uint8_t _quadrant{};
+    ObjectEntryIndex _sceneryType{};
+    uint8_t _primaryColour{};
+    uint8_t _secondaryColour{};
 
 public:
     SmallScenerySetColourAction() = default;
diff --git a/src/openrct2/actions/StaffHireNewAction.hpp b/src/openrct2/actions/StaffHireNewAction.hpp
index 6fc888a217..716f590f41 100644
--- a/src/openrct2/actions/StaffHireNewAction.hpp
+++ b/src/openrct2/actions/StaffHireNewAction.hpp
@@ -22,6 +22,7 @@
 #include "../scenario/Scenario.h"
 #include "../ui/UiContext.h"
 #include "../ui/WindowManager.h"
+#include "../util/Util.h"
 #include "../world/Entrance.h"
 #include "../world/Park.h"
 #include "../world/Sprite.h"
@@ -53,10 +54,10 @@ public:
 DEFINE_GAME_ACTION(StaffHireNewAction, GAME_COMMAND_HIRE_NEW_STAFF_MEMBER, StaffHireNewActionResult)
 {
 private:
-    bool _autoPosition = false;
-    uint8_t _staffType = static_cast<uint8_t>(StaffType::Count);
-    EntertainerCostume _entertainerType = EntertainerCostume::Count;
-    uint32_t _staffOrders = 0;
+    bool _autoPosition{};
+    uint8_t _staffType{ EnumValue(StaffType::Count) };
+    EntertainerCostume _entertainerType{ EntertainerCostume::Count };
+    uint32_t _staffOrders{};
 
 public:
     StaffHireNewAction() = default;
diff --git a/src/openrct2/actions/StaffSetColourAction.hpp b/src/openrct2/actions/StaffSetColourAction.hpp
index a2695b9345..dcb32cd821 100644
--- a/src/openrct2/actions/StaffSetColourAction.hpp
+++ b/src/openrct2/actions/StaffSetColourAction.hpp
@@ -23,8 +23,8 @@
 DEFINE_GAME_ACTION(StaffSetColourAction, GAME_COMMAND_SET_STAFF_COLOUR, GameActionResult)
 {
 private:
-    uint8_t _staffType;
-    uint8_t _colour;
+    uint8_t _staffType{};
+    uint8_t _colour{};
 
 public:
     StaffSetColourAction() = default;
diff --git a/src/openrct2/actions/StaffSetCostumeAction.hpp b/src/openrct2/actions/StaffSetCostumeAction.hpp
index f9f0769fa8..3ae71e7e64 100644
--- a/src/openrct2/actions/StaffSetCostumeAction.hpp
+++ b/src/openrct2/actions/StaffSetCostumeAction.hpp
@@ -41,8 +41,8 @@ constexpr const bool peep_slow_walking_types[] = {
 DEFINE_GAME_ACTION(StaffSetCostumeAction, GAME_COMMAND_SET_STAFF_COSTUME, GameActionResult)
 {
 private:
-    uint16_t _spriteIndex;
-    EntertainerCostume _costume;
+    uint16_t _spriteIndex{ SPRITE_INDEX_NULL };
+    EntertainerCostume _costume = EntertainerCostume::Count;
 
 public:
     StaffSetCostumeAction() = default;
diff --git a/src/openrct2/actions/StaffSetNameAction.hpp b/src/openrct2/actions/StaffSetNameAction.hpp
index 27ed819cb8..4fc49262b2 100644
--- a/src/openrct2/actions/StaffSetNameAction.hpp
+++ b/src/openrct2/actions/StaffSetNameAction.hpp
@@ -25,7 +25,7 @@
 DEFINE_GAME_ACTION(StaffSetNameAction, GAME_COMMAND_SET_STAFF_NAME, GameActionResult)
 {
 private:
-    uint16_t _spriteIndex;
+    uint16_t _spriteIndex{ SPRITE_INDEX_NULL };
     std::string _name;
 
 public:
diff --git a/src/openrct2/actions/StaffSetOrdersAction.hpp b/src/openrct2/actions/StaffSetOrdersAction.hpp
index 003d0c4020..8868d8eead 100644
--- a/src/openrct2/actions/StaffSetOrdersAction.hpp
+++ b/src/openrct2/actions/StaffSetOrdersAction.hpp
@@ -21,8 +21,8 @@
 DEFINE_GAME_ACTION(StaffSetOrdersAction, GAME_COMMAND_SET_STAFF_ORDERS, GameActionResult)
 {
 private:
-    uint16_t _spriteIndex;
-    uint8_t _ordersId;
+    uint16_t _spriteIndex{ SPRITE_INDEX_NULL };
+    uint8_t _ordersId{};
 
 public:
     StaffSetOrdersAction() = default;
diff --git a/src/openrct2/actions/SurfaceSetStyleAction.hpp b/src/openrct2/actions/SurfaceSetStyleAction.hpp
index 91ec255f9f..bd2bd1bad0 100644
--- a/src/openrct2/actions/SurfaceSetStyleAction.hpp
+++ b/src/openrct2/actions/SurfaceSetStyleAction.hpp
@@ -24,8 +24,8 @@ DEFINE_GAME_ACTION(SurfaceSetStyleAction, GAME_COMMAND_CHANGE_SURFACE_STYLE, Gam
 {
 private:
     MapRange _range;
-    ObjectEntryIndex _surfaceStyle;
-    ObjectEntryIndex _edgeStyle;
+    ObjectEntryIndex _surfaceStyle{};
+    ObjectEntryIndex _edgeStyle{};
 
 public:
     SurfaceSetStyleAction() = default;
diff --git a/src/openrct2/actions/TileModifyAction.hpp b/src/openrct2/actions/TileModifyAction.hpp
index 1a18612d59..d4f955592d 100644
--- a/src/openrct2/actions/TileModifyAction.hpp
+++ b/src/openrct2/actions/TileModifyAction.hpp
@@ -46,9 +46,9 @@ DEFINE_GAME_ACTION(TileModifyAction, GAME_COMMAND_MODIFY_TILE, GameActionResult)
 {
 private:
     CoordsXY _loc;
-    uint8_t _setting{ 0 };
-    uint32_t _value1{ 0 };
-    uint32_t _value2{ 0 };
+    uint8_t _setting{};
+    uint32_t _value1{};
+    uint32_t _value2{};
     TileElement _pasteElement{};
 
 public:
diff --git a/src/openrct2/actions/TrackPlaceAction.hpp b/src/openrct2/actions/TrackPlaceAction.hpp
index e56c0190d8..fcd2d11156 100644
--- a/src/openrct2/actions/TrackPlaceAction.hpp
+++ b/src/openrct2/actions/TrackPlaceAction.hpp
@@ -45,14 +45,14 @@ public:
 DEFINE_GAME_ACTION(TrackPlaceAction, GAME_COMMAND_PLACE_TRACK, TrackPlaceActionResult)
 {
 private:
-    NetworkRideId_t _rideIndex;
-    int32_t _trackType;
+    NetworkRideId_t _rideIndex{ RideIdNewNull };
+    int32_t _trackType{};
     CoordsXYZD _origin;
-    int32_t _brakeSpeed;
-    int32_t _colour;
-    int32_t _seatRotation;
-    int32_t _trackPlaceFlags;
-    bool _fromTrackDesign;
+    int32_t _brakeSpeed{};
+    int32_t _colour{};
+    int32_t _seatRotation{};
+    int32_t _trackPlaceFlags{};
+    bool _fromTrackDesign{};
 
 public:
     TrackPlaceAction() = default;
diff --git a/src/openrct2/actions/TrackRemoveAction.hpp b/src/openrct2/actions/TrackRemoveAction.hpp
index a32e36b3c3..054739b6c4 100644
--- a/src/openrct2/actions/TrackRemoveAction.hpp
+++ b/src/openrct2/actions/TrackRemoveAction.hpp
@@ -22,8 +22,8 @@
 DEFINE_GAME_ACTION(TrackRemoveAction, GAME_COMMAND_REMOVE_TRACK, GameActionResult)
 {
 private:
-    int32_t _trackType{ 0 };
-    int32_t _sequence{ 0 };
+    int32_t _trackType{};
+    int32_t _sequence{};
     CoordsXYZD _origin;
 
 public:
diff --git a/src/openrct2/actions/TrackSetBrakeSpeedAction.hpp b/src/openrct2/actions/TrackSetBrakeSpeedAction.hpp
index be97a68a85..248ebd93fa 100644
--- a/src/openrct2/actions/TrackSetBrakeSpeedAction.hpp
+++ b/src/openrct2/actions/TrackSetBrakeSpeedAction.hpp
@@ -16,8 +16,8 @@ DEFINE_GAME_ACTION(TrackSetBrakeSpeedAction, GAME_COMMAND_SET_BRAKES_SPEED, Game
 {
 private:
     CoordsXYZ _loc;
-    track_type_t _trackType;
-    uint8_t _brakeSpeed;
+    track_type_t _trackType{};
+    uint8_t _brakeSpeed{};
 
 public:
     TrackSetBrakeSpeedAction() = default;
diff --git a/src/openrct2/actions/WallSetColourAction.hpp b/src/openrct2/actions/WallSetColourAction.hpp
index f63158a676..c72e6db8bc 100644
--- a/src/openrct2/actions/WallSetColourAction.hpp
+++ b/src/openrct2/actions/WallSetColourAction.hpp
@@ -25,9 +25,9 @@ DEFINE_GAME_ACTION(WallSetColourAction, GAME_COMMAND_SET_WALL_COLOUR, GameAction
 {
 private:
     CoordsXYZD _loc;
-    int32_t _primaryColour;
-    int32_t _secondaryColour;
-    int32_t _tertiaryColour;
+    int32_t _primaryColour{};
+    int32_t _secondaryColour{};
+    int32_t _tertiaryColour{};
 
 public:
     WallSetColourAction() = default;
diff --git a/src/openrct2/actions/WaterSetHeightAction.hpp b/src/openrct2/actions/WaterSetHeightAction.hpp
index 1d6e337ae9..bda4019663 100644
--- a/src/openrct2/actions/WaterSetHeightAction.hpp
+++ b/src/openrct2/actions/WaterSetHeightAction.hpp
@@ -19,7 +19,7 @@ DEFINE_GAME_ACTION(WaterSetHeightAction, GAME_COMMAND_SET_WATER_HEIGHT, GameActi
 {
 private:
     CoordsXY _coords;
-    uint8_t _height;
+    uint8_t _height{};
 
 public:
     WaterSetHeightAction() = default;