diff --git a/src/object/ObjectRepository.cpp b/src/object/ObjectRepository.cpp
index 1e37cebc89..f81b30a51d 100644
--- a/src/object/ObjectRepository.cpp
+++ b/src/object/ObjectRepository.cpp
@@ -94,11 +94,11 @@ static void ReportMissingObject(const rct_object_entry * entry);
 
 class ObjectRepository : public IObjectRepository
 {
-    IPlatformEnvironment *              _env;
+    IPlatformEnvironment *              _env = nullptr;
     std::vector<ObjectRepositoryItem>   _items;
-    QueryDirectoryResult                _queryDirectoryResult;
+    QueryDirectoryResult                _queryDirectoryResult = { 0 };
     ObjectEntryMap                      _itemMap;
-    uint16                              _languageId;
+    uint16                              _languageId = 0;
 
 public:
     ObjectRepository(IPlatformEnvironment * env)
diff --git a/src/ride/TrackDesignRepository.cpp b/src/ride/TrackDesignRepository.cpp
index 623340e06f..ca9d22501c 100644
--- a/src/ride/TrackDesignRepository.cpp
+++ b/src/ride/TrackDesignRepository.cpp
@@ -68,7 +68,7 @@ private:
     IPlatformEnvironment * _env;
 
     std::vector<TrackRepositoryItem> _items;
-    QueryDirectoryResult _directoryQueryResult;
+    QueryDirectoryResult _directoryQueryResult = { 0 };
 
 public:
     TrackDesignRepository(IPlatformEnvironment * env)