diff --git a/engine/lua/lgc.cpp b/engine/lua/lgc.cpp
index 9bb4cb86a04..b7331233f48 100644
--- a/engine/lua/lgc.cpp
+++ b/engine/lua/lgc.cpp
@@ -83,7 +83,7 @@ static int32 ismarked(TObject *o) {
 		return o->value.cl->head.marked;
 	case LUA_T_PROTO:
 		return o->value.tf->head.marked;
-#ifdef DEBUG
+#ifdef LUA_DEBUG
 	case LUA_T_LINE:
 	case LUA_T_CLMARK:
 	case LUA_T_CMARK: