--- a/mercurial/localrepo.py	Thu May 10 18:52:04 2012 +0200
+++ b/mercurial/localrepo.py	Thu May 10 18:52:07 2012 +0200
@@ -932,7 +932,7 @@
         def unlock():
             self.store.write()
             if self._dirtyphases:
-                phases.writeroots(self)
+                phases.writeroots(self, self._phaseroots)
                 self._dirtyphases = False
             for k, ce in self._filecache.items():
                 if k == 'dirstate':