--- a/mercurial/exchange.py	Tue Apr 15 13:57:15 2014 -0400
+++ b/mercurial/exchange.py	Tue Apr 15 11:27:55 2014 -0400
@@ -659,7 +659,7 @@
     bundler = bundle2.bundle20(repo.ui)
     part = bundle2.bundlepart('changegroup', data=cg.getchunks())
     bundler.addpart(part)
-    return bundle2.unbundle20(repo.ui, util.chunkbuffer(bundler.getchunks()))
+    return util.chunkbuffer(bundler.getchunks())
 
 class PushRaced(RuntimeError):
     """An exception raised during unbundling that indicate a push race"""