--- a/dom/workers/ServiceWorkerEvents.cpp
+++ b/dom/workers/ServiceWorkerEvents.cpp
@@ -59,18 +59,18 @@ CancelChannelRunnable::CancelChannelRunn
   , mStatus(aStatus)
 {
 }
 
 NS_IMETHODIMP
 CancelChannelRunnable::Run()
 {
   MOZ_ASSERT(NS_IsMainThread());
-  nsresult rv = mChannel->Cancel(mStatus);
-  NS_ENSURE_SUCCESS(rv, rv);
+  mChannel->Cancel(mStatus);
+  mRegistration->MaybeScheduleUpdate();
   return NS_OK;
 }
 
 FetchEvent::FetchEvent(EventTarget* aOwner)
   : ExtendableEvent(aOwner)
   , mPreventDefaultLineNumber(0)
   , mPreventDefaultColumnNumber(0)
   , mIsReload(false)

--- a/dom/workers/ServiceWorkerPrivate.cpp
+++ b/dom/workers/ServiceWorkerPrivate.cpp
@@ -1257,20 +1257,16 @@ private:
         event->ReportCanceled();
       } else if (event->WidgetEventPtr()->mFlags.mExceptionHasBeenRisen) {
         // Exception logged via the WorkerPrivate ErrorReporter
       } else {
         runnable = new ResumeRequest(mInterceptedChannel);
       }
 
       if (!runnable) {
-        nsCOMPtr<nsIRunnable> updateRunnable =
-          new RegistrationUpdateRunnable(mRegistration, false /* time check */);
-        NS_DispatchToMainThread(runnable.forget());
-
         runnable = new CancelChannelRunnable(mInterceptedChannel,
                                              mRegistration,
                                              NS_ERROR_INTERCEPTION_FAILED);
       }
 
       MOZ_ALWAYS_TRUE(NS_SUCCEEDED(NS_DispatchToMainThread(runnable)));
     }