diff --git a/dom/fetch/FetchDriver.cpp b/dom/fetch/FetchDriver.cpp
index 995ed6188234..7b90bd23b895 100644
--- a/dom/fetch/FetchDriver.cpp
+++ b/dom/fetch/FetchDriver.cpp
@@ -332,6 +332,7 @@ FetchDriver::HttpFetch()
     // dom/workers/ServiceWorkerManager.cpp
     internalChan->SetCorsMode(static_cast<uint32_t>(mRequest->Mode()));
     internalChan->SetRedirectMode(static_cast<uint32_t>(mRequest->GetRedirectMode()));
+    internalChan->SetFetchCacheMode(static_cast<uint32_t>(mRequest->GetCacheMode()));
   }
 
   // Step 5. Proxy authentication will be handled by Necko.
diff --git a/dom/fetch/InternalRequest.h b/dom/fetch/InternalRequest.h
index 7c07bf49cb01..018900d9ee58 100644
--- a/dom/fetch/InternalRequest.h
+++ b/dom/fetch/InternalRequest.h
@@ -117,6 +117,7 @@ public:
   InternalRequest(const nsACString& aURL,
                   const nsACString& aMethod,
                   already_AddRefed<InternalHeaders> aHeaders,
+                  RequestCache aCacheMode,
                   RequestMode aMode,
                   RequestRedirect aRequestRedirect,
                   RequestCredentials aRequestCredentials,
@@ -132,7 +133,7 @@ public:
     , mMode(aMode)
     , mCredentialsMode(aRequestCredentials)
     , mResponseTainting(LoadTainting::Basic)
-    , mCacheMode(RequestCache::Default)
+    , mCacheMode(aCacheMode)
     , mRedirectMode(aRequestRedirect)
     , mAuthenticationFlag(false)
     , mForceOriginHeader(false)
diff --git a/dom/workers/ServiceWorkerPrivate.cpp b/dom/workers/ServiceWorkerPrivate.cpp
index 35a17122c52d..b02a4229a036 100644
--- a/dom/workers/ServiceWorkerPrivate.cpp
+++ b/dom/workers/ServiceWorkerPrivate.cpp
@@ -990,6 +990,7 @@ class FetchEventRunnable : public ExtendableFunctionalEventWorkerRunnable
   nsCString mMethod;
   nsString mClientId;
   bool mIsReload;
+  RequestCache mCacheMode;
   RequestMode mRequestMode;
   RequestRedirect mRequestRedirect;
   RequestCredentials mRequestCredentials;
@@ -1013,6 +1014,7 @@ public:
     , mScriptSpec(aScriptSpec)
     , mClientId(aDocumentId)
     , mIsReload(aIsReload)
+    , mCacheMode(RequestCache::Default)
     , mRequestMode(RequestMode::No_cors)
     , mRequestRedirect(RequestRedirect::Follow)
     // By default we set it to same-origin since normal HTTP fetches always
@@ -1110,11 +1112,16 @@ public:
 
     mRequestMode = InternalRequest::MapChannelToRequestMode(channel);
 
-    // This is safe due to static_asserts at top of file.
+    // This is safe due to static_asserts in ServiceWorkerManager.cpp.
     uint32_t redirectMode;
     internalChannel->GetRedirectMode(&redirectMode);
     mRequestRedirect = static_cast<RequestRedirect>(redirectMode);
 
+    // This is safe due to static_asserts in ServiceWorkerManager.cpp.
+    uint32_t cacheMode;
+    internalChannel->GetFetchCacheMode(&cacheMode);
+    mCacheMode = static_cast<RequestCache>(cacheMode);
+
     mRequestCredentials = InternalRequest::MapChannelToRequestCredentials(channel);
 
     rv = httpChannel->VisitNonDefaultRequestHeaders(this);
@@ -1206,6 +1213,7 @@ private:
     RefPtr<InternalRequest> internalReq = new InternalRequest(mSpec,
                                                               mMethod,
                                                               internalHeaders.forget(),
+                                                              mCacheMode,
                                                               mRequestMode,
                                                               mRequestRedirect,
                                                               mRequestCredentials,