diff -r 4898b14dcd69 Lib/msilib/__init__.py
--- a/Lib/msilib/__init__.py	Mon Jul 25 07:14:15 2011 +0200
+++ b/Lib/msilib/__init__.py	Mon Jul 25 17:21:59 2011 +0100
@@ -271,7 +271,7 @@
         if Win64:
             flags |= 256
         if keyfile:
-            keyid = self.cab.gen_id(self.absolute, keyfile)
+            keyid = self.cab.gen_id(keyfile)
             self.keyfiles[keyfile] = keyid
         else:
             keyid = None