diff --git a/lib/zone.ts b/lib/zone.ts
index f37d3903e..69393ab65 100644
--- a/lib/zone.ts
+++ b/lib/zone.ts
@@ -1145,7 +1145,7 @@ const Zone: ZoneType = (function(global: any) {
   if (NativePromise) {
     patchThen(NativePromise);
     if (typeof global['fetch'] !== 'undefined') {
-      const fetchPromise = global['fetch']();
+      const fetchPromise = global['fetch']('about://blank');
       // ignore output to prevent error;
       fetchPromise.then(() => null, () => null);
       if (fetchPromise.constructor != NativePromise) {