--- a/mercurial/configitems.py	Sun Oct 15 18:02:11 2017 +0200
+++ b/mercurial/configitems.py	Tue Oct 17 12:07:24 2017 +0200
@@ -841,6 +841,9 @@
 coreconfigitem('push', 'pushvars.server',
     default=False,
 )
+coreconfigitem('server', 'bookmarks-pushkey-compat',
+    default=True,
+)
 coreconfigitem('server', 'bundle1',
     default=True,
 )