--- a/mercurial/changegroup.py	Sun Oct 15 00:05:00 2017 -0400
+++ b/mercurial/changegroup.py	Sun Oct 08 21:42:32 2017 +0200
@@ -313,7 +313,7 @@
 
             if not cgnodes:
                 repo.ui.develwarn('applied empty changegroup',
-                                  config='empty-changegroup')
+                                  config='warn-empty-changegroup')
             clend = len(cl)
             changesets = clend - clstart
             repo.ui.progress(_('changesets'), None)