--- a/mercurial/obsolete.py	Tue Sep 16 19:13:08 2014 -0700
+++ b/mercurial/obsolete.py	Tue Sep 16 17:57:44 2014 -0700
@@ -450,7 +450,7 @@
     # parents: (tuple of nodeid) or None, parents of precursors
     #          None is used when no data has been recorded
 
-    def __init__(self, sopener, defaultformat=_fm0version):
+    def __init__(self, sopener, defaultformat=_fm1version):
         # caches for various obsolescence related cache
         self.caches = {}
         self._all = []