diff --git a/dom/performance/PerformanceResourceTiming.h b/dom/performance/PerformanceResourceTiming.h
index 690ed43616c5..b768528ff97d 100644
--- a/dom/performance/PerformanceResourceTiming.h
+++ b/dom/performance/PerformanceResourceTiming.h
@@ -64,7 +64,7 @@ public:
   }
 
   DOMHighResTimeStamp WorkerStart() const {
-    return mTiming && mTiming->TimingAllowed()
+    return mTiming
         ? mTiming->WorkerStartHighRes()
         : 0;
   }