diff -r 53ee02b54e53 -r e110e2b79135 mercurial/exchange.py
--- a/mercurial/exchange.py	Thu Apr 17 17:46:26 2014 -0400
+++ b/mercurial/exchange.py	Thu Apr 17 17:16:21 2014 -0400
@@ -726,6 +726,7 @@
         # push can proceed
         if util.safehasattr(cg, 'params'):
             tr = repo.transaction('unbundle')
+            tr.hookargs['bundle2-exp'] = '1'
             r = bundle2.processbundle(repo, cg, lambda: tr).reply
             tr.close()
         else: