--- a/mercurial/changelog.py	Sat Nov 08 16:27:50 2014 +0000
+++ b/mercurial/changelog.py	Sat Nov 08 16:31:38 2014 +0000
@@ -5,7 +5,6 @@
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
-import weakref
 from node import bin, hex, nullid
 from i18n import _
 import util, error, revlog, encoding
@@ -240,8 +239,7 @@
                                            self._delaybuf)
         self._delayed = True
         tr.addpending('cl-%i' % id(self), self._writepending)
-        trp = weakref.proxy(tr)
-        tr.addfinalize('cl-%i' % id(self), lambda: self._finalize(trp))
+        tr.addfinalize('cl-%i' % id(self), self._finalize)
 
     def _finalize(self, tr):
         "finalize index updates"