diff --git a/ui/tests/unit/utils/behaviors/stats-tracker-frame-missing.js b/ui/tests/unit/utils/behaviors/stats-tracker-frame-missing.js
index 80c6adc30..e72f83601 100644
--- a/ui/tests/unit/utils/behaviors/stats-tracker-frame-missing.js
+++ b/ui/tests/unit/utils/behaviors/stats-tracker-frame-missing.js
@@ -23,7 +23,7 @@ export default function statsTrackerFrameMissing({
 
     let shouldFail = false;
     const fetch = () => {
-      return resolve(shouldFail ? { ok: false } : new MockResponse(frame));
+      return resolve(shouldFail ? { ok: false } : MockResponse(frame));
     };
 
     const resource = ResourceConstructor();