diff -r 7a20fe8dc080 -r 0c5088be66af mercurial/wireproto.py
--- a/mercurial/wireproto.py	Thu Apr 17 15:27:54 2014 -0400
+++ b/mercurial/wireproto.py	Thu Apr 17 15:33:17 2014 -0400
@@ -587,7 +587,7 @@
             caps.append('streamreqs=%s' % ','.join(requiredformats))
     if repo.ui.configbool('server', 'bundle2', False):
         capsblob = bundle2.encodecaps(repo.bundle2caps)
-        caps.append('bundle2=' + urllib.quote(capsblob))
+        caps.append('bundle2-exp=' + urllib.quote(capsblob))
     caps.append('unbundle=%s' % ','.join(changegroupmod.bundlepriority))
     caps.append('httpheader=1024')
     return caps