--- a/mercurial/manifest.py	Fri May 05 04:48:42 2017 +0530
+++ b/mercurial/manifest.py	Mon May 08 09:39:21 2017 -0700
@@ -1317,8 +1317,7 @@
             cachesize = opts.get('manifestcachesize', cachesize)
         self._treeinmem = usetreemanifest
 
-        self._oldmanifest = repo._constructmanifest()
-        self._revlog = self._oldmanifest
+        self._revlog = repo._constructmanifest()
 
         # A cache of the manifestctx or treemanifestctx for each directory
         self._dirmancache = {}