diff --git a/netwerk/protocol/http/nsIHttpHeaderVisitor.idl b/netwerk/protocol/http/nsIHttpHeaderVisitor.idl
index 0a20fa256f0..37a6ae74677 100644
--- a/netwerk/protocol/http/nsIHttpHeaderVisitor.idl
+++ b/netwerk/protocol/http/nsIHttpHeaderVisitor.idl
@@ -41,7 +41,7 @@
 /**
  * Implement this interface to visit http headers.
  */
-[scriptable, uuid(0cf40717-d7c1-4a94-8c1e-d6c9734101bb)]
+[scriptable, function, uuid(35412859-b9d9-423c-8866-2d4559fdd2be)]
 interface nsIHttpHeaderVisitor : nsISupports
 {
     /**