--- a/mercurial/configitems.py	Sat Jun 17 13:17:10 2017 +0200
+++ b/mercurial/configitems.py	Sat Jun 17 13:25:42 2017 +0200
@@ -39,6 +39,9 @@
 coreconfigitem('patch', 'fuzz',
     default=2,
 )
+coreconfigitem('ui', 'clonebundleprefers',
+    default=[],
+)
 coreconfigitem('ui', 'quiet',
     default=False,
 )