diff -r 3f807237dc94 -r 6acbe86c6490 mercurial/cmdutil.py
--- a/mercurial/cmdutil.py	Wed Jan 09 19:54:01 2019 -0800
+++ b/mercurial/cmdutil.py	Sat Jan 12 17:43:36 2019 +0900
@@ -2588,7 +2588,7 @@
         obsmetadata = None
         if opts.get('note'):
             obsmetadata = {'note': encoding.fromlocal(opts['note'])}
-        backup = ui.configbool('ui', 'history-editing-backup')
+        backup = ui.configbool('rewrite', 'backup-bundle')
         scmutil.cleanupnodes(repo, mapping, 'amend', metadata=obsmetadata,
                              fixphase=True, targetphase=commitphase,
                              backup=backup)