diff -r 12cd3827b860 -r bdb6d97f0a04 mercurial/localrepo.py
--- a/mercurial/localrepo.py	Thu May 22 17:20:52 2014 -0700
+++ b/mercurial/localrepo.py	Sat May 31 16:48:29 2014 -0700
@@ -182,7 +182,9 @@
 
     bundle2caps = {'HG2X': (),
                    'b2x:listkeys': (),
-                   'b2x:pushkey': ()}
+                   'b2x:pushkey': (),
+                   'b2x:changegroup': (),
+                  }
 
     # a list of (ui, featureset) functions.
     # only functions defined in module of enabled extensions are invoked