diff --git a/mozilla/xpcom/ds/nsIWritablePropertyBag2.idl b/mozilla/xpcom/ds/nsIWritablePropertyBag2.idl
index 9968015df93..353e61a839b 100644
--- a/mozilla/xpcom/ds/nsIWritablePropertyBag2.idl
+++ b/mozilla/xpcom/ds/nsIWritablePropertyBag2.idl
@@ -39,7 +39,7 @@
 
 #include "nsIPropertyBag2.idl"
 
-[scriptable, uuid(ee42c54a-19d3-472b-8bc3-76318d5ab5f4)]
+[scriptable, uuid(9cfd1587-360e-4957-a58f-4c2b1c5e7ed9)]
 interface nsIWritablePropertyBag2 : nsIPropertyBag2
 {
   void        setPropertyAsInt32       (in AString prop, in PRInt32 value);