diff --git a/mercurial/changegroup.py b/mercurial/changegroup.py
--- a/mercurial/changegroup.py
+++ b/mercurial/changegroup.py
@@ -313,7 +313,7 @@ class cg1unpacker(object):
 
             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)
diff --git a/mercurial/configitems.py b/mercurial/configitems.py
--- a/mercurial/configitems.py
+++ b/mercurial/configitems.py
@@ -220,7 +220,7 @@ coreconfigitem('devel', 'deprec-warn',
 coreconfigitem('devel', 'disableloaddefaultcerts',
     default=False,
 )
-coreconfigitem('devel', 'empty-changegroup',
+coreconfigitem('devel', 'warn-empty-changegroup',
     default=False,
 )
 coreconfigitem('devel', 'legacy.exchange',