diff --git a/mercurial/wireproto.py b/mercurial/wireproto.py
--- a/mercurial/wireproto.py
+++ b/mercurial/wireproto.py
@@ -555,7 +555,7 @@ def unbundle(repo, proto, heads):
     their_heads = decodelist(heads)
 
     def check_heads():
-        heads = repo.heads()
+        heads = phases.visibleheads(repo)
         heads_hash = util.sha1(''.join(sorted(heads))).digest()
         return (their_heads == ['force'] or their_heads == heads or
                 their_heads == ['hashed', heads_hash])