--- a/mercurial/changelog.py	Mon Oct 17 22:51:22 2016 -0700
+++ b/mercurial/changelog.py	Fri Oct 14 02:25:08 2016 +0200
@@ -267,7 +267,7 @@
         # Delta chains for changelogs tend to be very small because entries
         # tend to be small and don't delta well with each. So disable delta
         # chains.
-        self._storedeltachains = False
+        self.storedeltachains = False
 
         self._realopener = opener
         self._delayed = False