diff -r 10d40c83205b -r ae17555ef93f mercurial/localrepo.py
--- a/mercurial/localrepo.py	Thu Jul 19 14:17:26 2018 -0400
+++ b/mercurial/localrepo.py	Fri Jul 20 09:08:20 2018 +0200
@@ -668,8 +668,8 @@
         manifestcachesize = self.ui.configint('format', 'manifestcachesize')
         if manifestcachesize is not None:
             self.svfs.options['manifestcachesize'] = manifestcachesize
-        deltabothparents = self.ui.configbool('revlog',
-                                              'optimize-delta-parent-choice')
+        deltabothparents = self.ui.configbool('storage',
+            'revlog.optimize-delta-parent-choice')
         self.svfs.options['deltabothparents'] = deltabothparents
         self.svfs.options['lazydeltabase'] = not scmutil.gddeltaconfig(self.ui)
         chainspan = self.ui.configbytes('experimental', 'maxdeltachainspan')