--- a/mercurial/configitems.py	Thu Jul 19 14:17:26 2018 -0400
+++ b/mercurial/configitems.py	Fri Jul 20 09:08:20 2018 +0200
@@ -927,7 +927,7 @@
 coreconfigitem('push', 'pushvars.server',
     default=False,
 )
-coreconfigitem('revlog', 'optimize-delta-parent-choice',
+coreconfigitem('storage', 'revlog.optimize-delta-parent-choice',
     default=True,
     alias=[('format', 'aggressivemergedeltas')],
 )