diff -r ce818cf215dc -r f38b0a3308b6 mercurial/manifest.py
--- a/mercurial/manifest.py	Sat Aug 21 10:48:49 2010 -0500
+++ b/mercurial/manifest.py	Sat Aug 21 19:30:42 2010 +0200
@@ -36,9 +36,7 @@
 
     def readdelta(self, node):
         r = self.rev(node)
-        if self._parentdelta:
-            return self.parse(mdiff.patchtext(self.revdiff(self.deltaparent(r), r)))
-        return self.parse(mdiff.patchtext(self.revdiff(r - 1, r)))
+        return self.parse(mdiff.patchtext(self.revdiff(self.deltaparent(r), r)))
 
     def read(self, node):
         if node == revlog.nullid: