diff -r 1619efcde9a4 -r be16091ac14d mercurial/context.py
--- a/mercurial/context.py	Mon Sep 12 14:29:09 2016 -0700
+++ b/mercurial/context.py	Mon Sep 12 10:55:43 2016 -0700
@@ -528,7 +528,7 @@
 
     @propertycache
     def _manifest(self):
-        return self._repo.manifestlog[self._changeset.manifest]
+        return self._repo.manifestlog[self._changeset.manifest].read()
 
     @propertycache
     def _manifestdelta(self):