diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index a55346167a..7951048ee0 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -138,6 +138,9 @@ add_files(
     dock_gui.cpp
     driver.cpp
     driver.h
+    dropdown.cpp
+    dropdown_func.h
+    dropdown_type.h
     economy.cpp
     economy_base.h
     economy_cmd.h
@@ -393,6 +396,8 @@ add_files(
     signs_func.h
     signs_gui.cpp
     signs_type.h
+    slider.cpp
+    slider_func.h
     slope_func.h
     slope_type.h
     smallmap_gui.cpp
diff --git a/src/airport_gui.cpp b/src/airport_gui.cpp
index e0e1adf461..3e40208db1 100644
--- a/src/airport_gui.cpp
+++ b/src/airport_gui.cpp
@@ -22,7 +22,7 @@
 #include "station_type.h"
 #include "newgrf_airport.h"
 #include "newgrf_callbacks.h"
-#include "widgets/dropdown_type.h"
+#include "dropdown_type.h"
 #include "core/geometry_func.hpp"
 #include "hotkeys.h"
 #include "vehicle_func.h"
diff --git a/src/autoreplace_gui.cpp b/src/autoreplace_gui.cpp
index f4586350ee..a69786dc2f 100644
--- a/src/autoreplace_gui.cpp
+++ b/src/autoreplace_gui.cpp
@@ -24,7 +24,7 @@
 #include "core/geometry_func.hpp"
 #include "rail_gui.h"
 #include "road_gui.h"
-#include "widgets/dropdown_func.h"
+#include "dropdown_func.h"
 #include "autoreplace_cmd.h"
 #include "group_cmd.h"
 #include "settings_cmd.h"
diff --git a/src/bridge_gui.cpp b/src/bridge_gui.cpp
index 9cb6f56c25..97f152457e 100644
--- a/src/bridge_gui.cpp
+++ b/src/bridge_gui.cpp
@@ -18,7 +18,7 @@
 #include "gfx_func.h"
 #include "tunnelbridge.h"
 #include "sortlist_type.h"
-#include "widgets/dropdown_func.h"
+#include "dropdown_func.h"
 #include "core/geometry_func.hpp"
 #include "tunnelbridge_map.h"
 #include "road_gui.h"
diff --git a/src/build_vehicle_gui.cpp b/src/build_vehicle_gui.cpp
index a21a139c1a..0b458f3868 100644
--- a/src/build_vehicle_gui.cpp
+++ b/src/build_vehicle_gui.cpp
@@ -25,7 +25,7 @@
 #include "window_func.h"
 #include "timer/timer_game_calendar.h"
 #include "vehicle_func.h"
-#include "widgets/dropdown_func.h"
+#include "dropdown_func.h"
 #include "engine_gui.h"
 #include "cargotype.h"
 #include "core/geometry_func.hpp"
diff --git a/src/company_cmd.cpp b/src/company_cmd.cpp
index bee3b6032f..2f68a61817 100644
--- a/src/company_cmd.cpp
+++ b/src/company_cmd.cpp
@@ -34,12 +34,13 @@
 #include "game/game.hpp"
 #include "goal_base.h"
 #include "story_base.h"
-#include "widgets/statusbar_widget.h"
 #include "company_cmd.h"
 #include "timer/timer.h"
 #include "timer/timer_game_economy.h"
 #include "timer/timer_game_tick.h"
 
+#include "widgets/statusbar_widget.h"
+
 #include "table/strings.h"
 
 #include "safeguards.h"
diff --git a/src/company_gui.cpp b/src/company_gui.cpp
index 21743d31f9..74ce478601 100644
--- a/src/company_gui.cpp
+++ b/src/company_gui.cpp
@@ -23,7 +23,7 @@
 #include "company_manager_face.h"
 #include "strings_func.h"
 #include "timer/timer_game_economy.h"
-#include "widgets/dropdown_type.h"
+#include "dropdown_type.h"
 #include "tilehighlight_func.h"
 #include "company_base.h"
 #include "core/geometry_func.hpp"
diff --git a/src/date_gui.cpp b/src/date_gui.cpp
index 20a6718aeb..e5c2438cd2 100644
--- a/src/date_gui.cpp
+++ b/src/date_gui.cpp
@@ -14,8 +14,8 @@
 #include "window_gui.h"
 #include "date_gui.h"
 #include "core/geometry_func.hpp"
+#include "dropdown_type.h"
 
-#include "widgets/dropdown_type.h"
 #include "widgets/date_widget.h"
 
 #include "safeguards.h"
diff --git a/src/widgets/dropdown.cpp b/src/dropdown.cpp
similarity index 98%
rename from src/widgets/dropdown.cpp
rename to src/dropdown.cpp
index a4a1d9953c..2e70120069 100644
--- a/src/widgets/dropdown.cpp
+++ b/src/dropdown.cpp
@@ -7,19 +7,18 @@
 
 /** @file dropdown.cpp Implementation of the dropdown widget. */
 
-#include "../stdafx.h"
-#include "../window_gui.h"
-#include "../string_func.h"
-#include "../strings_func.h"
-#include "../window_func.h"
-#include "../zoom_func.h"
-#include "../timer/timer.h"
-#include "../timer/timer_window.h"
+#include "stdafx.h"
 #include "dropdown_type.h"
+#include "strings_func.h"
+#include "timer/timer.h"
+#include "timer/timer_window.h"
+#include "window_gui.h"
+#include "window_func.h"
+#include "zoom_func.h"
 
-#include "dropdown_widget.h"
+#include "widgets/dropdown_widget.h"
 
-#include "../safeguards.h"
+#include "safeguards.h"
 
 
 static constexpr NWidgetPart _nested_dropdown_menu_widgets[] = {
diff --git a/src/widgets/dropdown_func.h b/src/dropdown_func.h
similarity index 87%
rename from src/widgets/dropdown_func.h
rename to src/dropdown_func.h
index 7cc10f56f2..65e4d272af 100644
--- a/src/widgets/dropdown_func.h
+++ b/src/dropdown_func.h
@@ -7,12 +7,12 @@
 
 /** @file dropdown_func.h Functions related to the drop down widget. */
 
-#ifndef WIDGETS_DROPDOWN_FUNC_H
-#define WIDGETS_DROPDOWN_FUNC_H
+#ifndef DROPDOWN_FUNC_H
+#define DROPDOWN_FUNC_H
 
-#include "../window_gui.h"
+#include "window_gui.h"
 
 /* Show drop down menu containing a fixed list of strings */
 void ShowDropDownMenu(Window *w, const StringID *strings, int selected, WidgetID button, uint32_t disabled_mask, uint32_t hidden_mask, uint width = 0);
 
-#endif /* WIDGETS_DROPDOWN_FUNC_H */
+#endif /* DROPDOWN_FUNC_H */
diff --git a/src/widgets/dropdown_type.h b/src/dropdown_type.h
similarity index 96%
rename from src/widgets/dropdown_type.h
rename to src/dropdown_type.h
index 89adabde09..fd102b43f2 100644
--- a/src/widgets/dropdown_type.h
+++ b/src/dropdown_type.h
@@ -7,17 +7,17 @@
 
 /** @file dropdown_type.h Types related to the drop down widget. */
 
-#ifndef WIDGETS_DROPDOWN_TYPE_H
-#define WIDGETS_DROPDOWN_TYPE_H
+#ifndef DROPDOWN_TYPE_H
+#define DROPDOWN_TYPE_H
 
-#include "../window_type.h"
-#include "../gfx_func.h"
-#include "../gfx_type.h"
-#include "../palette_func.h"
-#include "../string_func.h"
-#include "../strings_func.h"
-#include "../table/strings.h"
-#include "../window_gui.h"
+#include "window_type.h"
+#include "gfx_func.h"
+#include "gfx_type.h"
+#include "palette_func.h"
+#include "string_func.h"
+#include "strings_func.h"
+#include "table/strings.h"
+#include "window_gui.h"
 
 /**
  * Base list item class from which others are derived.
@@ -217,4 +217,4 @@ Dimension GetDropDownListDimension(const DropDownList &list);
 
 void ReplaceDropDownList(Window *parent, DropDownList &&list);
 
-#endif /* WIDGETS_DROPDOWN_TYPE_H */
+#endif /* DROPDOWN_TYPE_H */
diff --git a/src/game/game_gui.cpp b/src/game/game_gui.cpp
index 22f94ef055..b6c6c7588a 100644
--- a/src/game/game_gui.cpp
+++ b/src/game/game_gui.cpp
@@ -14,7 +14,7 @@
 #include "../window_func.h"
 #include "../network/network.h"
 #include "../network/network_content.h"
-#include "../widgets/dropdown_func.h"
+#include "../dropdown_func.h"
 #include "../timer/timer.h"
 #include "../timer/timer_window.h"
 
diff --git a/src/genworld_gui.cpp b/src/genworld_gui.cpp
index 33689ea80d..d0071b63ca 100644
--- a/src/genworld_gui.cpp
+++ b/src/genworld_gui.cpp
@@ -18,8 +18,8 @@
 #include "sound_func.h"
 #include "fios.h"
 #include "string_func.h"
-#include "widgets/dropdown_type.h"
-#include "widgets/dropdown_func.h"
+#include "dropdown_type.h"
+#include "dropdown_func.h"
 #include "querystring_gui.h"
 #include "town.h"
 #include "core/geometry_func.hpp"
diff --git a/src/ground_vehicle.hpp b/src/ground_vehicle.hpp
index f8bc393b73..6ff4041603 100644
--- a/src/ground_vehicle.hpp
+++ b/src/ground_vehicle.hpp
@@ -14,6 +14,7 @@
 #include "vehicle_gui.h"
 #include "landscape.h"
 #include "window_func.h"
+
 #include "widgets/vehicle_widget.h"
 
 /** What is the status of our acceleration? */
diff --git a/src/group_gui.cpp b/src/group_gui.cpp
index 812f7a9e86..1143de9f0f 100644
--- a/src/group_gui.cpp
+++ b/src/group_gui.cpp
@@ -18,7 +18,7 @@
 #include "vehicle_func.h"
 #include "autoreplace_gui.h"
 #include "company_func.h"
-#include "widgets/dropdown_func.h"
+#include "dropdown_func.h"
 #include "tilehighlight_func.h"
 #include "vehicle_gui_base.h"
 #include "core/geometry_func.hpp"
diff --git a/src/help_gui.cpp b/src/help_gui.cpp
index 8012a880a1..fdf2975393 100644
--- a/src/help_gui.cpp
+++ b/src/help_gui.cpp
@@ -15,8 +15,8 @@
 #include "table/control_codes.h"
 #include "string_func.h"
 #include "openttd.h"
-
 #include "help_gui.h"
+
 #include "widgets/help_widget.h"
 #include "widgets/misc_widget.h"
 
diff --git a/src/industry_gui.cpp b/src/industry_gui.cpp
index d4bbf88497..e08e391ef1 100644
--- a/src/industry_gui.cpp
+++ b/src/industry_gui.cpp
@@ -28,15 +28,14 @@
 #include "tilehighlight_func.h"
 #include "string_func.h"
 #include "sortlist_type.h"
-#include "widgets/dropdown_func.h"
+#include "dropdown_func.h"
 #include "company_base.h"
 #include "core/geometry_func.hpp"
 #include "core/random_func.hpp"
 #include "core/backup_type.hpp"
 #include "genworld.h"
 #include "smallmap_gui.h"
-#include "widgets/dropdown_type.h"
-#include "widgets/industry_widget.h"
+#include "dropdown_type.h"
 #include "clear_map.h"
 #include "zoom_func.h"
 #include "industry_cmd.h"
@@ -46,6 +45,8 @@
 #include "timer/timer_window.h"
 #include "hotkeys.h"
 
+#include "widgets/industry_widget.h"
+
 #include "table/strings.h"
 
 #include <bitset>
diff --git a/src/league_gui.cpp b/src/league_gui.cpp
index 2e0e6ee9d0..3e9c5ca833 100644
--- a/src/league_gui.cpp
+++ b/src/league_gui.cpp
@@ -9,7 +9,6 @@
 
 #include "stdafx.h"
 #include "league_gui.h"
-
 #include "company_base.h"
 #include "company_gui.h"
 #include "gui.h"
@@ -22,7 +21,9 @@
 #include "town.h"
 #include "viewport_func.h"
 #include "window_gui.h"
+
 #include "widgets/league_widget.h"
+
 #include "table/strings.h"
 #include "table/sprites.h"
 
diff --git a/src/music_gui.cpp b/src/music_gui.cpp
index 3af86476e2..081cd3650b 100644
--- a/src/music_gui.cpp
+++ b/src/music_gui.cpp
@@ -24,9 +24,9 @@
 #include "string_func.h"
 #include "settings_type.h"
 #include "settings_gui.h"
-#include "widgets/dropdown_func.h"
-#include "widgets/dropdown_type.h"
-#include "widgets/slider_func.h"
+#include "dropdown_func.h"
+#include "dropdown_type.h"
+#include "slider_func.h"
 #include "mixer.h"
 
 #include "widgets/music_widget.h"
diff --git a/src/network/network_gui.cpp b/src/network/network_gui.cpp
index 29b6c18433..13e1c76eff 100644
--- a/src/network/network_gui.cpp
+++ b/src/network/network_gui.cpp
@@ -23,8 +23,8 @@
 #include "network_udp.h"
 #include "../window_func.h"
 #include "../gfx_func.h"
-#include "../widgets/dropdown_type.h"
-#include "../widgets/dropdown_func.h"
+#include "../dropdown_type.h"
+#include "../dropdown_func.h"
 #include "../querystring_gui.h"
 #include "../sortlist_type.h"
 #include "../company_func.h"
diff --git a/src/newgrf_gui.cpp b/src/newgrf_gui.cpp
index f534996a6b..d70cfda897 100644
--- a/src/newgrf_gui.cpp
+++ b/src/newgrf_gui.cpp
@@ -16,8 +16,8 @@
 #include "gamelog.h"
 #include "settings_type.h"
 #include "settings_func.h"
-#include "widgets/dropdown_type.h"
-#include "widgets/dropdown_func.h"
+#include "dropdown_type.h"
+#include "dropdown_func.h"
 #include "network/network.h"
 #include "network/network_content.h"
 #include "sortlist_type.h"
diff --git a/src/news_gui.cpp b/src/news_gui.cpp
index f84676080c..36200d003d 100644
--- a/src/news_gui.cpp
+++ b/src/news_gui.cpp
@@ -21,7 +21,7 @@
 #include "town.h"
 #include "sound_func.h"
 #include "string_func.h"
-#include "widgets/dropdown_func.h"
+#include "dropdown_func.h"
 #include "statusbar_gui.h"
 #include "company_manager_face.h"
 #include "company_func.h"
diff --git a/src/order_gui.cpp b/src/order_gui.cpp
index 137fd1b76c..f6ee4d9421 100644
--- a/src/order_gui.cpp
+++ b/src/order_gui.cpp
@@ -15,8 +15,8 @@
 #include "timetable.h"
 #include "strings_func.h"
 #include "company_func.h"
-#include "widgets/dropdown_type.h"
-#include "widgets/dropdown_func.h"
+#include "dropdown_type.h"
+#include "dropdown_func.h"
 #include "textbuf_gui.h"
 #include "string_func.h"
 #include "tilehighlight_func.h"
diff --git a/src/rail_gui.cpp b/src/rail_gui.cpp
index dce5f61b91..71fc9c6c49 100644
--- a/src/rail_gui.cpp
+++ b/src/rail_gui.cpp
@@ -21,7 +21,7 @@
 #include "window_func.h"
 #include "sound_func.h"
 #include "company_func.h"
-#include "widgets/dropdown_type.h"
+#include "dropdown_type.h"
 #include "tunnelbridge.h"
 #include "tilehighlight_func.h"
 #include "spritecache.h"
diff --git a/src/rail_gui.h b/src/rail_gui.h
index ef51130e8b..46e91b0430 100644
--- a/src/rail_gui.h
+++ b/src/rail_gui.h
@@ -11,7 +11,7 @@
 #define RAIL_GUI_H
 
 #include "rail_type.h"
-#include "widgets/dropdown_type.h"
+#include "dropdown_type.h"
 
 struct Window *ShowBuildRailToolbar(RailType railtype);
 void ReinitGuiAfterToggleElrail(bool disable);
diff --git a/src/road_gui.h b/src/road_gui.h
index 580c11e32e..fefce6b534 100644
--- a/src/road_gui.h
+++ b/src/road_gui.h
@@ -13,7 +13,7 @@
 #include "road_type.h"
 #include "tile_type.h"
 #include "direction_type.h"
-#include "widgets/dropdown_type.h"
+#include "dropdown_type.h"
 
 struct Window *ShowBuildRoadToolbar(RoadType roadtype);
 struct Window *ShowBuildRoadScenToolbar(RoadType roadtype);
diff --git a/src/screenshot_gui.cpp b/src/screenshot_gui.cpp
index 8a91dc7eb3..2505b7cbbe 100644
--- a/src/screenshot_gui.cpp
+++ b/src/screenshot_gui.cpp
@@ -11,10 +11,14 @@
 #include "window_func.h"
 #include "window_gui.h"
 #include "screenshot.h"
-#include "widgets/screenshot_widget.h"
-#include "table/strings.h"
 #include "gfx_func.h"
 
+#include "widgets/screenshot_widget.h"
+
+#include "table/strings.h"
+
+#include "safeguards.h"
+
 struct ScreenshotWindow : Window {
 	ScreenshotWindow(WindowDesc *desc) : Window(desc)
 	{
diff --git a/src/script/script_gui.cpp b/src/script/script_gui.cpp
index 40ac7e3cfd..d6855bdd6c 100644
--- a/src/script/script_gui.cpp
+++ b/src/script/script_gui.cpp
@@ -17,7 +17,7 @@
 #include "../company_gui.h"
 #include "../window_func.h"
 #include "../network/network.h"
-#include "../widgets/dropdown_func.h"
+#include "../dropdown_func.h"
 #include "../hotkeys.h"
 #include "../company_cmd.h"
 #include "../misc_cmd.h"
diff --git a/src/settings_gui.cpp b/src/settings_gui.cpp
index ba0ce024f7..2043373dc6 100644
--- a/src/settings_gui.cpp
+++ b/src/settings_gui.cpp
@@ -19,9 +19,9 @@
 #include "strings_func.h"
 #include "window_func.h"
 #include "string_func.h"
-#include "widgets/dropdown_type.h"
-#include "widgets/dropdown_func.h"
-#include "widgets/slider_func.h"
+#include "dropdown_type.h"
+#include "dropdown_func.h"
+#include "slider_func.h"
 #include "highscore.h"
 #include "base_media_base.h"
 #include "company_base.h"
diff --git a/src/settings_gui.h b/src/settings_gui.h
index b0ad28862f..c95345b00a 100644
--- a/src/settings_gui.h
+++ b/src/settings_gui.h
@@ -11,7 +11,7 @@
 #define SETTING_GUI_H
 
 #include "gfx_type.h"
-#include "widgets/dropdown_type.h"
+#include "dropdown_type.h"
 
 /** Width of setting buttons */
 #define SETTING_BUTTON_WIDTH  ((int)NWidgetScrollbar::GetHorizontalDimension().width * 2)
diff --git a/src/widgets/slider.cpp b/src/slider.cpp
similarity index 95%
rename from src/widgets/slider.cpp
rename to src/slider.cpp
index b5553e56cb..67894a88d2 100644
--- a/src/widgets/slider.cpp
+++ b/src/slider.cpp
@@ -7,15 +7,15 @@
 
 /** @file slider.cpp Implementation of the horizontal slider widget. */
 
-#include "../stdafx.h"
-#include "../palette_func.h"
-#include "../window_gui.h"
-#include "../window_func.h"
-#include "../strings_func.h"
-#include "../zoom_func.h"
+#include "stdafx.h"
+#include "gfx_func.h"
+#include "palette_func.h"
 #include "slider_func.h"
+#include "strings_func.h"
+#include "window_gui.h"
+#include "zoom_func.h"
 
-#include "../safeguards.h"
+#include "safeguards.h"
 
 static const int SLIDER_WIDTH = 3;
 
diff --git a/src/widgets/slider_func.h b/src/slider_func.h
similarity index 88%
rename from src/widgets/slider_func.h
rename to src/slider_func.h
index fc2c9f8113..0aaa39bf15 100644
--- a/src/widgets/slider_func.h
+++ b/src/slider_func.h
@@ -7,11 +7,11 @@
 
 /** @file slider_type.h Types related to the horizontal slider widget. */
 
-#ifndef WIDGETS_SLIDER_TYPE_H
-#define WIDGETS_SLIDER_TYPE_H
+#ifndef SLIDER_TYPE_H
+#define SLIDER_TYPE_H
 
-#include "../window_type.h"
-#include "../gfx_func.h"
+#include "core/geometry_type.hpp"
+#include "strings_type.h"
 
 void DrawSliderWidget(Rect r, int min_value, int max_value, int value, const std::map<int, StringID> &labels);
 bool ClickSliderWidget(Rect r, Point pt, int min_value, int max_value, int &value);
@@ -24,4 +24,4 @@ inline bool ClickSliderWidget(Rect r, Point pt, int min_value, int max_value, ui
 	return true;
 }
 
-#endif /* WIDGETS_SLIDER_TYPE_H */
+#endif /* SLIDER_TYPE_H */
diff --git a/src/smallmap_gui.cpp b/src/smallmap_gui.cpp
index 068881cb5d..4bfa47b6de 100644
--- a/src/smallmap_gui.cpp
+++ b/src/smallmap_gui.cpp
@@ -26,11 +26,12 @@
 #include "strings_func.h"
 #include "blitter/factory.hpp"
 #include "linkgraph/linkgraph_gui.h"
-#include "widgets/smallmap_widget.h"
 #include "timer/timer.h"
 #include "timer/timer_window.h"
 #include "smallmap_gui.h"
 
+#include "widgets/smallmap_widget.h"
+
 #include "table/strings.h"
 
 #include <bitset>
diff --git a/src/station_cmd.cpp b/src/station_cmd.cpp
index bee14e7bd4..5ae1b6735d 100644
--- a/src/station_cmd.cpp
+++ b/src/station_cmd.cpp
@@ -55,7 +55,6 @@
 #include "company_gui.h"
 #include "linkgraph/linkgraph_base.h"
 #include "linkgraph/refresh.h"
-#include "widgets/station_widget.h"
 #include "tunnelbridge_map.h"
 #include "station_cmd.h"
 #include "waypoint_cmd.h"
@@ -68,6 +67,8 @@
 #include "timer/timer_game_tick.h"
 #include "cheat_type.h"
 
+#include "widgets/station_widget.h"
+
 #include "table/strings.h"
 
 #include <bitset>
diff --git a/src/station_gui.cpp b/src/station_gui.cpp
index 098be7a228..44b90c0714 100644
--- a/src/station_gui.cpp
+++ b/src/station_gui.cpp
@@ -20,7 +20,7 @@
 #include "string_func.h"
 #include "window_func.h"
 #include "viewport_func.h"
-#include "widgets/dropdown_func.h"
+#include "dropdown_func.h"
 #include "station_base.h"
 #include "waypoint_base.h"
 #include "tilehighlight_func.h"
diff --git a/src/story_gui.cpp b/src/story_gui.cpp
index f3ec75a53a..61e8e20965 100644
--- a/src/story_gui.cpp
+++ b/src/story_gui.cpp
@@ -15,8 +15,8 @@
 #include "core/geometry_func.hpp"
 #include "company_func.h"
 #include "command_func.h"
-#include "widgets/dropdown_type.h"
-#include "widgets/dropdown_func.h"
+#include "dropdown_type.h"
+#include "dropdown_func.h"
 #include "sortlist_type.h"
 #include "goal_base.h"
 #include "viewport_func.h"
diff --git a/src/textfile_gui.cpp b/src/textfile_gui.cpp
index 5976fff1b1..843a28faac 100644
--- a/src/textfile_gui.cpp
+++ b/src/textfile_gui.cpp
@@ -15,7 +15,7 @@
 #include "gfx_func.h"
 #include "string_func.h"
 #include "textfile_gui.h"
-#include "widgets/dropdown_type.h"
+#include "dropdown_type.h"
 #include "gfx_layout.h"
 #include "debug.h"
 #include "openttd.h"
diff --git a/src/town_gui.cpp b/src/town_gui.cpp
index dbe65e3742..14ddaa8619 100644
--- a/src/town_gui.cpp
+++ b/src/town_gui.cpp
@@ -31,7 +31,7 @@
 #include "core/geometry_func.hpp"
 #include "genworld.h"
 #include "stringfilter_type.h"
-#include "widgets/dropdown_func.h"
+#include "dropdown_func.h"
 #include "town_kdtree.h"
 #include "town_cmd.h"
 #include "timer/timer.h"
diff --git a/src/vehicle_gui.cpp b/src/vehicle_gui.cpp
index 99bb9dd9e5..0768c64b49 100644
--- a/src/vehicle_gui.cpp
+++ b/src/vehicle_gui.cpp
@@ -26,7 +26,7 @@
 #include "vehicle_func.h"
 #include "autoreplace_gui.h"
 #include "string_func.h"
-#include "widgets/dropdown_func.h"
+#include "dropdown_func.h"
 #include "timetable.h"
 #include "articulated_vehicles.h"
 #include "spritecache.h"
diff --git a/src/vehicle_gui_base.h b/src/vehicle_gui_base.h
index 3b63484494..c1a9c7a246 100644
--- a/src/vehicle_gui_base.h
+++ b/src/vehicle_gui_base.h
@@ -17,7 +17,7 @@
 #include "vehicle_base.h"
 #include "vehiclelist.h"
 #include "window_gui.h"
-#include "widgets/dropdown_type.h"
+#include "dropdown_type.h"
 
 typedef GUIList<const Vehicle*, std::nullptr_t, CargoID> GUIVehicleList;
 
diff --git a/src/widgets/CMakeLists.txt b/src/widgets/CMakeLists.txt
index dd28f14c8f..933e8c5056 100644
--- a/src/widgets/CMakeLists.txt
+++ b/src/widgets/CMakeLists.txt
@@ -11,9 +11,6 @@ add_files(
     date_widget.h
     depot_widget.h
     dock_widget.h
-    dropdown.cpp
-    dropdown_func.h
-    dropdown_type.h
     dropdown_widget.h
     engine_widget.h
     error_widget.h
@@ -48,8 +45,6 @@ add_files(
     script_widget.h
     settings_widget.h
     sign_widget.h
-    slider.cpp
-    slider_func.h
     smallmap_widget.h
     station_widget.h
     statusbar_widget.h