diff --git a/js/gdm/credentialManager.js b/js/gdm/credentialManager.js
index cf001f4e4..5c4bc7e62 100644
--- a/js/gdm/credentialManager.js
+++ b/js/gdm/credentialManager.js
@@ -1,7 +1,7 @@
 // -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
 /* exported CredentialManager */
 
-class CredentialManager {
+var CredentialManager = class CredentialManager {
     constructor(service) {
         this._token = null;
         this._service = service;
@@ -21,4 +21,4 @@ class CredentialManager {
     get service() {
         return this._service;
     }
-}
+};