diff -r 76effa770ff9 -r 1c11393d5dfb mercurial/localrepo.py
--- a/mercurial/localrepo.py	Thu Nov 06 14:20:05 2014 -0800
+++ b/mercurial/localrepo.py	Tue Nov 11 10:35:06 2014 -0500
@@ -316,7 +316,7 @@
         chunkcachesize = self.ui.configint('format', 'chunkcachesize')
         if chunkcachesize is not None:
             self.sopener.options['chunkcachesize'] = chunkcachesize
-        maxchainlen = self.ui.configint('revlog', 'maxchainlen')
+        maxchainlen = self.ui.configint('format', 'maxchainlen')
         if maxchainlen is not None:
             self.sopener.options['maxchainlen'] = maxchainlen