--- a/mercurial/commands.py	Tue Oct 27 10:06:17 2020 -0700
+++ b/mercurial/commands.py	Thu Oct 15 22:23:02 2020 -0700
@@ -2015,8 +2015,7 @@
 
     opts = pycompat.byteskwargs(opts)
     if opts.get(b'subrepos'):
-        if opts.get(b'amend'):
-            raise error.Abort(_(b'cannot amend with --subrepos'))
+        cmdutil.check_incompatible_arguments(opts, b'subrepos', [b'amend'])
         # Let --subrepos on the command line override config setting.
         ui.setconfig(b'ui', b'commitsubrepos', True, b'commit')