--- a/mercurial/configitems.py	Fri Jun 30 03:42:43 2017 +0200
+++ b/mercurial/configitems.py	Fri Jun 30 03:44:06 2017 +0200
@@ -113,6 +113,9 @@
 coreconfigitem('patch', 'fuzz',
     default=2,
 )
+coreconfigitem('server', 'bundle1',
+    default=True,
+)
 coreconfigitem('ui', 'clonebundleprefers',
     default=list,
 )