diff --git a/qbsp/merge.cc b/qbsp/merge.cc
index 1c6f298c..af1a8f4d 100644
--- a/qbsp/merge.cc
+++ b/qbsp/merge.cc
@@ -69,7 +69,7 @@ static face_t *TryMerge(face_t *f1, face_t *f2)
     bool keep1, keep2;
 
     if (!f1->w.size() || !f2->w.size() || f1->planeside != f2->planeside || f1->texinfo != f2->texinfo ||
-        /*!f1->contents[0].equals(options.target_game, f2->contents[0]) ||*/ !f1->contents[1].equals(options.target_game, f2->contents[1]) ||
+        /*!f1->contents[0].equals(options.target_game, f2->contents[0]) || !f1->contents[1].equals(options.target_game, f2->contents[1]) || */
         f1->lmshift[0] != f2->lmshift[0] || f1->lmshift[1] != f2->lmshift[1])
         return NULL;
 
diff --git a/qbsp/surfaces.cc b/qbsp/surfaces.cc
index 008b5301..2f102567 100644
--- a/qbsp/surfaces.cc
+++ b/qbsp/surfaces.cc
@@ -765,6 +765,17 @@ static face_t *FaceFromPortal(portal_t *p, int pside)
         return nullptr;
     }
 
+    if (!p->nodes[pside]->contents.is_empty(options.target_game)) {
+        bool our_contents_mirrorinside = options.target_game->contents_are_mirrored(p->nodes[pside]->contents);
+        if (!our_contents_mirrorinside) {
+            if (side->planeside != pside) {
+
+                return nullptr;
+            }
+        }
+    }
+
+
     if (pside)
     {
         f->w = p->winding->flip();