diff -r f1b7683f3f95 -r 95d785ccb4e5 mercurial/localrepo.py
--- a/mercurial/localrepo.py	Wed Jul 04 02:00:36 2012 +0200
+++ b/mercurial/localrepo.py	Wed Jul 04 02:02:48 2012 +0200
@@ -1808,9 +1808,8 @@
                             self.ui.warn(_('updating %s to public failed!\n')
                                             % newremotehead)
                 if 'obsolete' in self.listkeys('namespaces') and self.obsstore:
-                    data = self.obsstore._writemarkers()
-                    r = remote.pushkey('obsolete', 'dump', '',
-                                       base85.b85encode(data))
+                    data = self.listkeys('obsolete')['dump']
+                    r = remote.pushkey('obsolete', 'dump', '', data)
                     if not r:
                         self.ui.warn(_('failed to push obsolete markers!\n'))
             finally: