diff --git a/stepmania/src/Model.cpp b/stepmania/src/Model.cpp
index 7968ec6859..d715e200f0 100644
--- a/stepmania/src/Model.cpp
+++ b/stepmania/src/Model.cpp
@@ -848,7 +848,7 @@ public:
 	}
 };
 
-LUA_REGISTER_CLASS( Model )
+LUA_REGISTER_DERIVED_CLASS( Model, Actor )
 // lua end
 
 /*