diff --git a/src/openrct2/object/ObjectRepository.cpp b/src/openrct2/object/ObjectRepository.cpp
index 1936d2c693..32bd4ecc06 100644
--- a/src/openrct2/object/ObjectRepository.cpp
+++ b/src/openrct2/object/ObjectRepository.cpp
@@ -664,6 +664,9 @@ bool IsObjectCustom(const ObjectRepositoryItem* object)
 
     switch (object->GetFirstSourceGame())
     {
+        case ObjectSourceGame::RCT1:
+        case ObjectSourceGame::AddedAttractions:
+        case ObjectSourceGame::LoopyLandscapes:
         case ObjectSourceGame::RCT2:
         case ObjectSourceGame::WackyWorlds:
         case ObjectSourceGame::TimeTwister: