--- a/netwerk/protocol/http/AlternateServices.cpp
+++ b/netwerk/protocol/http/AlternateServices.cpp
@@ -537,16 +537,17 @@ public:
 
   nsresult Start()
   {
     LOG(("WellKnownChecker::Start %p\n", this));
     nsCOMPtr<nsILoadInfo> loadInfo = new LoadInfo(nsContentUtils::GetSystemPrincipal(),
                                                   nullptr, nullptr,
                                                   nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_IS_NULL,
                                                   nsIContentPolicy::TYPE_OTHER);
+    loadInfo->SetOriginAttributes(mCI->GetOriginAttributes());
 
     RefPtr<nsHttpChannel> chan = new nsHttpChannel();
     nsresult rv;
 
     mTransactionAlternate = new TransactionObserver(chan, this);
     RefPtr<nsHttpConnectionInfo> newCI = mCI->Clone();
     rv = MakeChannel(chan, mTransactionAlternate, newCI, mURI, mCaps, loadInfo);
     if (NS_FAILED(rv)) {