--- a/mercurial/statichttprepo.py	Tue Mar 17 14:29:56 2015 -0700
+++ b/mercurial/statichttprepo.py	Tue Feb 10 19:53:48 2015 -0800
@@ -141,6 +141,7 @@
         self._tags = None
         self.nodetagscache = None
         self._branchcaches = {}
+        self._revbranchcache = None
         self.encodepats = None
         self.decodepats = None