diff --git a/stepmania/src/LuaManager.h b/stepmania/src/LuaManager.h
index 64ebf68840..814ec890a4 100644
--- a/stepmania/src/LuaManager.h
+++ b/stepmania/src/LuaManager.h
@@ -128,6 +128,7 @@ namespace LuaHelpers
 	}
 
 	int TypeError( Lua *L, int narg, const char *tname );
+	int AbsIndex( Lua *L, int i ) { if( i > 0 || i <= LUA_REGISTRYINDEX ) return i; return lua_gettop( L ) + i + 1; }
 }