diff --git a/stepmania/src/Actor.h b/stepmania/src/Actor.h
index ac359bdb9b..df6d604aac 100644
--- a/stepmania/src/Actor.h
+++ b/stepmania/src/Actor.h
@@ -14,6 +14,7 @@ class LuaClass;
 #include "MessageManager.h"
 #include "Tween.h"
 
+typedef AutoPtrCopyOnWrite<LuaReference> apActorCommands;
 
 #define DRAW_ORDER_BEFORE_EVERYTHING		-200
 #define DRAW_ORDER_UNDERLAY			-100