--- a/hgext/mq.py	Wed Sep 18 14:40:17 2013 -0400
+++ b/hgext/mq.py	Sat Sep 07 15:07:10 2013 -0500
@@ -63,7 +63,7 @@
 from mercurial.node import bin, hex, short, nullid, nullrev
 from mercurial.lock import release
 from mercurial import commands, cmdutil, hg, scmutil, util, revset
-from mercurial import repair, extensions, error, phases
+from mercurial import repair, extensions, error, phases, bookmarks
 from mercurial import patch as patchmod
 from mercurial import localrepo
 import os, re, errno, shutil
@@ -3061,6 +3061,8 @@
             wlock.release()
 
     if opts.get('bookmark'):
+        if mark == repo._bookmarkcurrent:
+            bookmarks.setcurrent(repo, None)
         del marks[mark]
         marks.write()
         ui.write(_("bookmark '%s' deleted\n") % mark)