diff -r 3d54cf97598d -r 58dcf10eea2b mercurial/localrepo.py
--- a/mercurial/localrepo.py	Mon Sep 08 14:04:10 2008 +0200
+++ b/mercurial/localrepo.py	Wed Sep 10 08:48:23 2008 +0200
@@ -221,13 +221,7 @@
                 raise util.Abort(_('working copy of .hgtags is changed '
                                    '(please commit .hgtags manually)'))
 
-        parents = self[None].parents()
-        parent = None
-        # use tip instead of the parent rev if there's no working copy
-        # (avoid creating a new head)
-        if len(parents) == 1 and parents[0].node() == nullid:
-            parent = self['tip'].node()
-        self._tag(names, node, message, local, user, date, parent=parent)
+        self._tag(names, node, message, local, user, date)
 
     def tags(self):
         '''return a mapping of tag to node'''