diff --git a/webpack/attachments.js b/webpack/attachments.js
index 8c7424f14..bf16b1505 100644
--- a/webpack/attachments.js
+++ b/webpack/attachments.js
@@ -7,14 +7,13 @@ const workerCompact = './dist/fix/worker.compact.js';
 const lodashJs = "src/core/1.lodash.js";
 const jqueryJs = "src/core/platform/web/jquery/_jquery.js";
 
-const runtimePolyfill = sync(["@babel/polyfill", "es6-promise/auto"]);
+const runtimePolyfill = ["@babel/polyfill", "es6-promise/auto"];
 
 const basicAttachmentMap = {
     polyfill: sync([
         "src/core/0.foundation.js",
         "src/polyfill/**/*.js",
-        ...runtimePolyfill,
-    ]),
+    ]).concat(runtimePolyfill),
     core: sync([
         "src/less/core/**/*.less",
         "src/less/theme/**/*.less",