--- a/mercurial/configitems.py	Wed Oct 11 05:18:20 2017 +0200
+++ b/mercurial/configitems.py	Wed Oct 11 05:36:10 2017 +0200
@@ -632,6 +632,9 @@
 coreconfigitem('ui', 'interface',
     default=None,
 )
+coreconfigitem('ui', 'interface.chunkselector',
+    default=None,
+)
 coreconfigitem('ui', 'logblockedtimes',
     default=False,
 )