--- a/mercurial/context.py	Thu Oct 16 23:27:54 2014 -0700
+++ b/mercurial/context.py	Sun Dec 14 19:11:44 2014 -0800
@@ -409,7 +409,7 @@
 
             # lookup bookmarks through the name interface
             try:
-                self._node = repo.names.singlenode(changeid)
+                self._node = repo.names.singlenode(repo, changeid)
                 self._rev = repo.changelog.rev(self._node)
                 return
             except KeyError: