diff --git a/stepmania/src/ScreenManager.cpp b/stepmania/src/ScreenManager.cpp
index 0b1915aa0d..06f5d6474a 100644
--- a/stepmania/src/ScreenManager.cpp
+++ b/stepmania/src/ScreenManager.cpp
@@ -857,6 +857,7 @@ public:
 	}
 	static int SystemMessage( T* p, lua_State *L )		{ p->SystemMessage( SArg(1) ); return 0; }
 	static int ScreenIsPrepped( T* p, lua_State *L )	{ lua_pushboolean( L, ScreenManagerUtil::ScreenIsPrepped( SArg(1) ) ); return 1; }
+	static int ScreenClassExists( T* p, lua_State *L )	{ lua_pushboolean( L, g_pmapRegistrees->find( SArg(1) ) != g_pmapRegistrees->end() ); return 1; }
 
 	LunaScreenManager()
 	{
@@ -864,6 +865,7 @@ public:
 		ADD_METHOD( GetTopScreen );
 		ADD_METHOD( SystemMessage );
 		ADD_METHOD( ScreenIsPrepped );
+		ADD_METHOD( ScreenClassExists );
 	}
 };