diff -r 0bca4d31f647 -r 1d183b33f007 mercurial/commands.py
--- a/mercurial/commands.py	Tue Feb 12 15:47:30 2013 +0000
+++ b/mercurial/commands.py	Tue Feb 12 16:05:00 2013 +0000
@@ -467,12 +467,12 @@
             finally:
                 ui.setconfig('ui', 'forcemerge', '')
 
-        commit_opts = opts.copy()
-        if not commit_opts['message'] and not commit_opts['logfile']:
+        if not opts['message'] and not opts['logfile']:
             # we don't translate commit messages
-            commit_opts['message'] = "Backed out changeset %s" % short(node)
-            commit_opts['force_editor'] = True
-        commit(ui, repo, **commit_opts)
+            opts['message'] = "Backed out changeset %s" % short(node)
+            opts['force_editor'] = True
+        commit(ui, repo, **opts)
+
         def nice(node):
             return '%d:%s' % (repo.changelog.rev(node), short(node))
         ui.status(_('changeset %s backs out changeset %s\n') %