--- a/b2g/components/test/mochitest/systemapp_helper.js
+++ b/b2g/components/test/mochitest/systemapp_helper.js
@@ -89,17 +89,17 @@ let steps = [
     // Ensure that events are correctly sent to the frame.
     // `listener` is going to call next()
     frame.contentWindow.addEventListener("mozChromeEvent", listener);
     frame.contentWindow.addEventListener("custom", listener);
 
     // Ensure that listener being registered before the system app is ready
     // are correctly removed from the pending list
     function removedListener() {
-      assert(false, "Listener isn't correctly removed from the pending list");
+      assert.ok(false, "Listener isn't correctly removed from the pending list");
     }
     SystemAppProxy.addEventListener("mozChromeEvent", removedListener);
     SystemAppProxy.removeEventListener("mozChromeEvent", removedListener);
 
     // Register it to the JSM
     SystemAppProxy.registerFrame(frame);
     assert.ok(true, "Frame created and registered");