diff --git a/dom/workers/ServiceWorkerManager.cpp b/dom/workers/ServiceWorkerManager.cpp
index fa52486681b..c1dd85644f2 100644
--- a/dom/workers/ServiceWorkerManager.cpp
+++ b/dom/workers/ServiceWorkerManager.cpp
@@ -567,6 +567,7 @@ public:
                                   getter_AddRefs(serviceWorker));
 
     if (NS_WARN_IF(NS_FAILED(rv))) {
+      swm->mSetOfScopesBeingUpdated.Remove(mRegistration->mScope);
       Fail(NS_ERROR_DOM_ABORT_ERR);
       return rv;
     }
@@ -581,6 +582,7 @@ 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;
     }