diff --git a/dom/console/Console.cpp b/dom/console/Console.cpp
index 151ae629d94b..5ba73c6cb8d7 100644
--- a/dom/console/Console.cpp
+++ b/dom/console/Console.cpp
@@ -593,7 +593,7 @@ private:
         innerID = NS_LITERAL_STRING("ServiceWorker");
         // Use scope as ID so the webconsole can decide if the message should
         // show up per tab
-        id.AssignWithConversion(mWorkerPrivate->WorkerName());
+        id.AssignWithConversion(mWorkerPrivate->ServiceWorkerScope());
       } else {
         innerID = NS_LITERAL_STRING("Worker");
       }
diff --git a/dom/fetch/Fetch.cpp b/dom/fetch/Fetch.cpp
index b4baf5e77503..b58dc8f0f339 100644
--- a/dom/fetch/Fetch.cpp
+++ b/dom/fetch/Fetch.cpp
@@ -691,7 +691,7 @@ WorkerFetchResolver::FlushConsoleReport()
       return;
     }
 
-    swm->FlushReportsToAllClients(worker->WorkerName(), mReporter);
+    swm->FlushReportsToAllClients(worker->ServiceWorkerScope(), mReporter);
     return;
   }
 
diff --git a/dom/workers/ServiceWorkerClient.cpp b/dom/workers/ServiceWorkerClient.cpp
index b6506ea3d487..80f7eafb5c3c 100644
--- a/dom/workers/ServiceWorkerClient.cpp
+++ b/dom/workers/ServiceWorkerClient.cpp
@@ -265,7 +265,7 @@ ServiceWorkerClient::PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,
   // At the moment we only expose Client on ServiceWorker globals.
   MOZ_ASSERT(workerPrivate->IsServiceWorker());
   uint32_t serviceWorkerID = workerPrivate->ServiceWorkerID();
-  nsCString scope = workerPrivate->WorkerName();
+  nsCString scope = workerPrivate->ServiceWorkerScope();
 
   RefPtr<ServiceWorkerClientPostMessageRunnable> runnable =
     new ServiceWorkerClientPostMessageRunnable(serviceWorkerID, scope,
diff --git a/dom/workers/ServiceWorkerEvents.cpp b/dom/workers/ServiceWorkerEvents.cpp
index 6095a116d9b6..793e8e92eddd 100644
--- a/dom/workers/ServiceWorkerEvents.cpp
+++ b/dom/workers/ServiceWorkerEvents.cpp
@@ -833,7 +833,7 @@ public:
 
   WaitUntilHandler(WorkerPrivate* aWorkerPrivate, JSContext* aCx)
     : mWorkerPrivate(aWorkerPrivate)
-    , mScope(mWorkerPrivate->WorkerName())
+    , mScope(mWorkerPrivate->ServiceWorkerScope())
     , mLine(0)
     , mColumn(0)
   {
diff --git a/dom/workers/WorkerPrivate.cpp b/dom/workers/WorkerPrivate.cpp
index 9bbe5e753a55..c77f8661cc94 100644
--- a/dom/workers/WorkerPrivate.cpp
+++ b/dom/workers/WorkerPrivate.cpp
@@ -538,7 +538,7 @@ private:
       RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
       if (swm) {
         swm->HandleError(aCx, aWorkerPrivate->GetPrincipal(),
-                         aWorkerPrivate->WorkerName(),
+                         aWorkerPrivate->ServiceWorkerScope(),
                          aWorkerPrivate->ScriptURL(),
                          EmptyString(), EmptyString(), EmptyString(),
                          0, 0, JSREPORT_ERROR, JSEXN_ERR);
@@ -1181,7 +1181,7 @@ private:
         RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
         if (swm) {
           swm->HandleError(aCx, aWorkerPrivate->GetPrincipal(),
-                           aWorkerPrivate->WorkerName(),
+                           aWorkerPrivate->ServiceWorkerScope(),
                            aWorkerPrivate->ScriptURL(),
                            mReport.mMessage,
                            mReport.mFilename, mReport.mLine, mReport.mLineNumber,
@@ -6907,7 +6907,7 @@ WorkerPrivate::GetOrCreateGlobalScope(JSContext* aCx)
     if (IsSharedWorker()) {
       globalScope = new SharedWorkerGlobalScope(this, WorkerName());
     } else if (IsServiceWorker()) {
-      globalScope = new ServiceWorkerGlobalScope(this, WorkerName());
+      globalScope = new ServiceWorkerGlobalScope(this, ServiceWorkerScope());
     } else {
       globalScope = new DedicatedWorkerGlobalScope(this);
     }
diff --git a/dom/workers/WorkerPrivate.h b/dom/workers/WorkerPrivate.h
index 5e243ec1057c..66ae059fa463 100644
--- a/dom/workers/WorkerPrivate.h
+++ b/dom/workers/WorkerPrivate.h
@@ -526,6 +526,13 @@ public:
     return mLoadInfo.mServiceWorkerID;
   }
 
+  const nsCString&
+  ServiceWorkerScope() const
+  {
+    MOZ_DIAGNOSTIC_ASSERT(IsServiceWorker());
+    return mWorkerName;
+  }
+
   nsIURI*
   GetBaseURI() const
   {
@@ -835,7 +842,7 @@ public:
   const nsCString&
   WorkerName() const
   {
-    MOZ_ASSERT(IsServiceWorker() || IsSharedWorker());
+    MOZ_ASSERT(IsSharedWorker());
     return mWorkerName;
   }