diff --git a/hgext/keyword.py b/hgext/keyword.py
--- a/hgext/keyword.py
+++ b/hgext/keyword.py
@@ -614,14 +614,14 @@
         if kwt:
             kwt.match = origmatch
 
-def kw_amend(orig, ui, repo, commitfunc, old, extra, pats, opts):
+def kw_amend(orig, ui, repo, old, extra, pats, opts):
     '''Wraps cmdutil.amend expanding keywords after amend.'''
     kwt = getattr(repo, '_keywordkwt', None)
     if kwt is None:
-        return orig(ui, repo, commitfunc, old, extra, pats, opts)
+        return orig(ui, repo, old, extra, pats, opts)
     with repo.wlock():
         kwt.postcommit = True
-        newid = orig(ui, repo, commitfunc, old, extra, pats, opts)
+        newid = orig(ui, repo, old, extra, pats, opts)
         if newid != old.node():
             ctx = repo[newid]
             kwt.restrict = True
diff --git a/mercurial/cmdutil.py b/mercurial/cmdutil.py
--- a/mercurial/cmdutil.py
+++ b/mercurial/cmdutil.py
@@ -3026,8 +3026,7 @@
     else:
         return f not in ctx2.manifest()
 
-# TODO: remove the commitfunc parameter because it is no longer used
-def amend(ui, repo, commitfunc, old, extra, pats, opts):
+def amend(ui, repo, old, extra, pats, opts):
     # avoid cycle context -> subrepo -> cmdutil
     from . import context
 
diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -1550,15 +1550,7 @@
         if not obsolete.isenabled(repo, obsolete.createmarkersopt):
             cmdutil.checkunfinished(repo)
 
-        # commitfunc is used only for temporary amend commit by cmdutil.amend
-        def commitfunc(ui, repo, message, match, opts):
-            return repo.commit(message,
-                               opts.get('user') or old.user(),
-                               opts.get('date') or old.date(),
-                               match,
-                               extra=extra)
-
-        node = cmdutil.amend(ui, repo, commitfunc, old, extra, pats, opts)
+        node = cmdutil.amend(ui, repo, old, extra, pats, opts)
         if node == old.node():
             ui.status(_("nothing changed\n"))
             return 1
diff --git a/tests/test-obsolete.t b/tests/test-obsolete.t
--- a/tests/test-obsolete.t
+++ b/tests/test-obsolete.t
@@ -1213,11 +1213,9 @@
   > command = registrar.command(cmdtable)
   > @command(b"amendtransient",[], _('hg amendtransient [rev]'))
   > def amend(ui, repo, *pats, **opts):
-  >   def commitfunc(ui, repo, message, match, opts):
-  >     return repo.commit(message, repo['.'].user(), repo['.'].date(), match)
   >   opts['message'] = 'Test'
   >   opts['logfile'] = None
-  >   cmdutil.amend(ui, repo, commitfunc, repo['.'], {}, pats, opts)
+  >   cmdutil.amend(ui, repo, repo['.'], {}, pats, opts)
   >   ui.write('%s\n' % repo.changelog.headrevs())
   > EOF
   $ cat >> $HGRCPATH << EOF