diff --git a/js/apps/system/users/test/errors.js b/js/apps/system/users/test/errors.js
index bab4135536..169bd73dbb 100644
--- a/js/apps/system/users/test/errors.js
+++ b/js/apps/system/users/test/errors.js
@@ -24,7 +24,7 @@
           expect(err.stack).to.contain(err.message);
         });
         it('uses its name in its stack trace', function () {
-          var err = new UserError('potato');
+          var err = new UserError();
           expect(err.stack).to.contain(name);
         });
       });