--- a/mercurial/obsolete.py	Mon Nov 26 19:24:11 2012 +0100
+++ b/mercurial/obsolete.py	Mon Oct 08 16:55:00 2012 +0200
@@ -426,6 +426,7 @@
     """Return the set of revision that belong to the <name> set
 
     Such access may compute the set and cache it for future use"""
+    repo = repo.unfiltered()
     if not repo.obsstore:
         return ()
     if name not in repo.obsstore.caches: