--- a/mercurial/commands.py	Fri Aug 15 09:41:30 2014 -0700
+++ b/mercurial/commands.py	Thu Aug 14 01:53:07 2014 -0700
@@ -2341,7 +2341,7 @@
             try:
                 try:
                     repo.obsstore.create(tr, parsenodeid(precursor), succs,
-                                         opts['flags'], metadata)
+                                         opts['flags'], metadata=metadata)
                     tr.close()
                 except ValueError, exc:
                     raise util.Abort(_('bad obsmarker input: %s') % exc)