--- a/mercurial/context.py	Tue Aug 10 16:55:38 2010 +0200
+++ b/mercurial/context.py	Thu Jul 15 18:10:05 2010 +0200
@@ -75,7 +75,7 @@
 
     @propertycache
     def substate(self):
-        return subrepo.state(self)
+        return subrepo.state(self, self._repo.ui)
 
     def __contains__(self, key):
         return key in self._manifest