--- a/security/manager/ssl/nsICryptoHash.idl
+++ b/security/manager/ssl/nsICryptoHash.idl
@@ -5,17 +5,17 @@
 #include "nsISupports.idl"
 interface nsIInputStream;
 
 /**
  * nsICryptoHash
  * This interface provides crytographic hashing algorithms.
  */
 
-[scriptable, uuid(1e5b7c43-4688-45ce-92e1-77ed931e3bbe)]
+[builtinclass, scriptable, uuid(1e5b7c43-4688-45ce-92e1-77ed931e3bbe)]
 interface nsICryptoHash : nsISupports
 {
     /**
      * Hashing Algorithms.  These values are to be used by the
      * |init| method to indicate which hashing function to
      * use.  These values map directly onto the values defined
      * in mozilla/security/nss/lib/cryptohi/hasht.h.
      */