diff -r bd296bb4b5c8 -r 3a7d9c0c57a5 mercurial/revlog.py
--- a/mercurial/revlog.py	Sun Nov 16 00:24:23 2014 -0500
+++ b/mercurial/revlog.py	Fri Nov 14 14:36:25 2014 -0800
@@ -407,7 +407,7 @@
 
         See the documentation for ancestor.lazyancestors for more details."""
 
-        return ancestor.lazyancestors(self, revs, stoprev=stoprev,
+        return ancestor.lazyancestors(self.parentrevs, revs, stoprev=stoprev,
                                       inclusive=inclusive)
 
     def descendants(self, revs):