--- a/mercurial/configitems.py	Fri Jun 30 03:45:31 2017 +0200
+++ b/mercurial/configitems.py	Fri Jun 30 03:45:32 2017 +0200
@@ -585,6 +585,9 @@
 coreconfigitem('web', 'accesslog',
     default='-',
 )
+coreconfigitem('web', 'address',
+    default='',
+)
 coreconfigitem('worker', 'backgroundclose',
     default=dynamicdefault,
 )