diff --git a/accessible/public/nsIAccessibleValue.idl b/accessible/public/nsIAccessibleValue.idl
index 80bc62a3967e..4c55f885c8ea 100644
--- a/accessible/public/nsIAccessibleValue.idl
+++ b/accessible/public/nsIAccessibleValue.idl
@@ -39,7 +39,7 @@
 
 #include "nsISupports.idl"
 
-[scriptable, uuid(F4ABBC2F-0F28-47DC-A9E9-F7A1719AB2BE)]
+[scriptable, uuid(42a1e1dc-58cf-419d-bff0-ed3314c70016)]
 interface nsIAccessibleValue : nsISupports
 {
   readonly attribute double maximumValue;