--- a/mercurial/configitems.py	Sat Apr 21 17:31:03 2018 +0900
+++ b/mercurial/configitems.py	Mon May 14 12:38:05 2018 +0200
@@ -1225,7 +1225,8 @@
 coreconfigitem('web', 'address',
     default='',
 )
-coreconfigitem('web', 'allow_archive',
+coreconfigitem('web', 'allow-archive',
+    alias=[('web', 'allow_archive')],
     default=list,
 )
 coreconfigitem('web', 'allow_read',