--- a/accessible/interfaces/nsIAccessiblePivot.idl
+++ b/accessible/interfaces/nsIAccessiblePivot.idl
@@ -186,17 +186,17 @@ interface nsIAccessiblePivot : nsISuppor
    * @param aObserver [in] the observer object to remove from being notified.
    */
   void removeObserver(in nsIAccessiblePivotObserver aObserver);
 };
 
 /**
  * An observer interface for pivot changes.
  */
-[scriptable, uuid(b6508c5e-c081-467d-835c-613eedf9ee9b)]
+[scriptable, uuid(6006e502-3861-49bd-aba1-fa6d2e74e237)]
 interface nsIAccessiblePivotObserver : nsISupports
 {
   /**
    * Called when the pivot changes.
    *
    * @param aPivot           [in] the pivot that has changed.
    * @param aOldAccessible   [in] the old pivot position before the change,
    *                           or null.