diff -r e623898b80f5 -r e69a199bb127 mercurial/obsolete.py
--- a/mercurial/obsolete.py	Tue Sep 16 15:56:38 2014 -0700
+++ b/mercurial/obsolete.py	Tue Sep 16 15:57:51 2014 -0700
@@ -210,7 +210,7 @@
 
 # mapping to read/write various marker formats
 # <version> -> (decoder, encoder)
-formats = {0: (_fm0readmarkers, _fm0encodeonemarker)}
+formats = {_fm0version: (_fm0readmarkers, _fm0encodeonemarker)}
 
 def _readmarkers(data):
     """Read and enumerate markers from raw data"""