diff --git a/dom/workers/RuntimeService.cpp b/dom/workers/RuntimeService.cpp
index acd0b467aaa5..151b9e4c2ba0 100644
--- a/dom/workers/RuntimeService.cpp
+++ b/dom/workers/RuntimeService.cpp
@@ -1749,7 +1749,7 @@ RuntimeService::Init()
   rv = obs->AddObserver(this, NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID, false);
   NS_ENSURE_SUCCESS(rv, rv);
 
-  rv = obs->AddObserver(this, NS_XPCOM_WILL_SHUTDOWN_OBSERVER_ID, false);
+  rv = obs->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, false);
   NS_ENSURE_SUCCESS(rv, rv);
 
   mObserved = true;
@@ -2131,7 +2131,7 @@ RuntimeService::Cleanup()
         NS_WARNING("Failed to unregister for offline notification event!");
       }
       obs->RemoveObserver(this, NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID);
-      obs->RemoveObserver(this, NS_XPCOM_WILL_SHUTDOWN_OBSERVER_ID);
+      obs->RemoveObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID);
       mObserved = false;
     }
   }
@@ -2608,7 +2608,7 @@ RuntimeService::Observe(nsISupports* aSubject, const char* aTopic,
 {
   AssertIsOnMainThread();
 
-  if (!strcmp(aTopic, NS_XPCOM_WILL_SHUTDOWN_OBSERVER_ID)) {
+  if (!strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
     Shutdown();
     return NS_OK;
   }