diff --git a/src/register_types.cpp b/src/register_types.cpp
index 64061fe..033c432 100644
--- a/src/register_types.cpp
+++ b/src/register_types.cpp
@@ -66,7 +66,7 @@ void initialize_gdextension_types(gd::ModuleInitializationLevel p_level)
     GDREGISTER_CLASS(NavMarker);
     GDREGISTER_RUNTIME_CLASS(NavRoom);
     GDREGISTER_RUNTIME_CLASS(Inventory);
-    GDREGISTER_CLASS(RTSGameMode);
+    GDREGISTER_RUNTIME_CLASS(RTSGameMode);
     GDREGISTER_RUNTIME_CLASS(RTSPlayer);
 }