diff -r a6543fdcf869 -r 91f3ac205816 mercurial/localrepo.py
--- a/mercurial/localrepo.py	Tue May 29 23:26:55 2012 +0200
+++ b/mercurial/localrepo.py	Fri Jun 01 12:37:18 2012 -0700
@@ -1791,7 +1791,7 @@
             bases = [nullid]
         csets, bases, heads = cl.nodesbetween(bases, heads)
         # We assume that all ancestors of bases are known
-        common = set(cl.ancestors(*[cl.rev(n) for n in bases]))
+        common = set(cl.ancestors([cl.rev(n) for n in bases]))
         return self._changegroupsubset(common, csets, heads, source)
 
     def getlocalbundle(self, source, outgoing):