diff -r 539d9f839197 -r 5db105f216c3 mercurial/hg.py
--- a/mercurial/hg.py	Tue Apr 01 02:46:03 2014 +0900
+++ b/mercurial/hg.py	Tue Apr 01 02:46:03 2014 +0900
@@ -433,7 +433,7 @@
                         if bn == 'default':
                             status = _("updating to bookmark @\n")
                         else:
-                            status = _("updating to bookmark @ on branch %s\n"
+                            status = (_("updating to bookmark @ on branch %s\n")
                                        % bn)
                     except KeyError:
                         try: