--- a/hgext/extdiff.py	Sat May 13 17:53:55 2017 +0900
+++ b/hgext/extdiff.py	Sat Jan 09 23:07:20 2016 +0900
@@ -78,12 +78,13 @@
     error,
     filemerge,
     pycompat,
+    registrar,
     scmutil,
     util,
 )
 
 cmdtable = {}
-command = cmdutil.command(cmdtable)
+command = registrar.command(cmdtable)
 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or