--- a/mercurial/phases.py	Mon Jun 15 15:57:47 2015 -0700
+++ b/mercurial/phases.py	Mon Jun 15 16:08:22 2015 -0700
@@ -171,7 +171,7 @@
         return ph
 
     def replace(self, phcache):
-        for a in 'phaseroots dirty opener _phaserevs'.split():
+        for a in 'phaseroots dirty opener _phaserevs _phasesets'.split():
             setattr(self, a, getattr(phcache, a))
 
     def _getphaserevsnative(self, repo):