diff --git a/stepmania/src/ScreenManager.cpp b/stepmania/src/ScreenManager.cpp
index 353198d8d6..01d2f40b17 100644
--- a/stepmania/src/ScreenManager.cpp
+++ b/stepmania/src/ScreenManager.cpp
@@ -919,6 +919,7 @@ public:
 	}
 	static int SystemMessage( T* p, lua_State *L )		{ p->SystemMessage( SArg(1) ); return 0; }
 	static int ConcurrentlyPrepareScreen( T* p, lua_State *L )	{ p->ConcurrentlyPrepareScreen( SArg(1) ); return 0; }
+	static int ScreenIsPrepped( T* p, lua_State *L )	{ lua_pushboolean( L, ::ScreenIsPrepped( SArg(1) ) ); return 1; }
 
 	static void Register(lua_State *L)
 	{
@@ -926,6 +927,7 @@ public:
 		ADD_METHOD( GetTopScreen );
 		ADD_METHOD( SystemMessage );
 		ADD_METHOD( ConcurrentlyPrepareScreen );
+		ADD_METHOD( ScreenIsPrepped );
 
 		Luna<T>::Register( L );