--- a/mercurial/wireproto.py	Thu Dec 22 00:40:46 2011 +0100
+++ b/mercurial/wireproto.py	Thu Dec 22 00:42:25 2011 +0100
@@ -10,6 +10,7 @@
 from node import bin, hex
 import changegroup as changegroupmod
 import repo, error, encoding, util, store
+import phases
 
 # abstract batching support
 
@@ -449,7 +450,7 @@
     return streamres(proto.groupchunks(cg))
 
 def heads(repo, proto):
-    h = repo.heads()
+    h = phases.visibleheads(repo)
     return encodelist(h) + "\n"
 
 def hello(repo, proto):