--- a/uriloader/prefetch/nsOfflineCacheUpdate.cpp
+++ b/uriloader/prefetch/nsOfflineCacheUpdate.cpp
@@ -180,17 +180,17 @@ nsManifestCheck::Begin()
     NS_ENSURE_SUCCESS(rv, rv);
     rv = NS_NewChannel(getter_AddRefs(mChannel),
                        mURI,
                        mLoadingPrincipal,
                        nsILoadInfo::SEC_REQUIRE_SAME_ORIGIN_DATA_IS_BLOCKED,
                        nsIContentPolicy::TYPE_OTHER,
                        nullptr,   // loadGroup
                        nullptr,   // aCallbacks
-                       nsIRequest::LOAD_BYPASS_CACHE);
+                       nsIRequest::LOAD_BYPASS_CACHE | nsIChannel::LOAD_CLASSIFY_URI);
 
     NS_ENSURE_SUCCESS(rv, rv);
 
     // configure HTTP specific stuff
     nsCOMPtr<nsIHttpChannel> httpChannel =
         do_QueryInterface(mChannel);
     if (httpChannel) {
         httpChannel->SetReferrer(mReferrerURI);