--- a/mercurial/hg.py	Wed May 18 16:29:39 2005 -0800
+++ b/mercurial/hg.py	Wed May 18 16:31:51 2005 -0800
@@ -294,7 +294,8 @@
         return filelog(self.opener, f)
 
     def transaction(self):
-        return transaction(self.opener, self.join("journal"))
+        return transaction(self.opener, self.join("journal"),
+                           self.join("undo"))
 
     def commit(self, parent, update = None, text = ""):
         tr = self.transaction()