diff --git a/src/p_setup.c b/src/p_setup.c
index 5acc72746..b51dabdd0 100644
--- a/src/p_setup.c
+++ b/src/p_setup.c
@@ -181,6 +181,8 @@ FUNCNORETURN static ATTRNORETURN void CorruptMapError(const char *msg)
 static void P_ClearSingleMapHeaderInfo(INT16 i)
 {
 	const INT16 num = (INT16)(i-1);
+	INT32 exists = (mapheaderinfo[num]->menuflags & LF2_EXISTSHACK);
+
 	DEH_WriteUndoline("LEVELNAME", mapheaderinfo[num]->lvlttl, UNDO_NONE);
 	mapheaderinfo[num]->lvlttl[0] = '\0';
 	DEH_WriteUndoline("SUBTITLE", mapheaderinfo[num]->subttl, UNDO_NONE);
@@ -246,7 +248,7 @@ static void P_ClearSingleMapHeaderInfo(INT16 i)
 	DEH_WriteUndoline("LEVELFLAGS", va("%d", mapheaderinfo[num]->levelflags), UNDO_NONE);
 	mapheaderinfo[num]->levelflags = 0;
 	DEH_WriteUndoline("MENUFLAGS", va("%d", mapheaderinfo[num]->menuflags), UNDO_NONE);
-	mapheaderinfo[num]->menuflags = (mainwads ? 0 : LF2_EXISTSHACK); // see p_setup.c - prevents replacing maps in addons with easier versions
+	mapheaderinfo[num]->menuflags = exists; // see p_setup.c - prevents replacing maps in addons with easier versions
 	// TODO grades support for delfile (pfft yeah right)
 	P_DeleteGrades(num);
 	// SRB2Kart