diff --git a/dom/workers/ServiceWorkerManager.cpp b/dom/workers/ServiceWorkerManager.cpp
index bff013760bb8..7b2b42d0b0b9 100644
--- a/dom/workers/ServiceWorkerManager.cpp
+++ b/dom/workers/ServiceWorkerManager.cpp
@@ -566,7 +566,6 @@ public:
                                   getter_AddRefs(serviceWorker));
 
     if (NS_WARN_IF(NS_FAILED(rv))) {
-      swm->mSetOfScopesBeingUpdated.Remove(mRegistration->mScope);
       Fail(NS_ERROR_DOM_ABORT_ERR);
       return rv;
     }
@@ -581,7 +580,6 @@ public:
     jsapi.Init();
     bool ok = r->Dispatch(jsapi.cx());
     if (NS_WARN_IF(!ok)) {
-      swm->mSetOfScopesBeingUpdated.Remove(mRegistration->mScope);
       Fail(NS_ERROR_DOM_ABORT_ERR);
       return rv;
     }