diff --git a/external/dist/webpack.js b/external/dist/webpack.js
index ca9cc836861c4..13cbb1141cb15 100644
--- a/external/dist/webpack.js
+++ b/external/dist/webpack.js
@@ -16,7 +16,7 @@
 "use strict";
 
 var pdfjs = require("./build/pdf.js");
-var PdfjsWorker = require("worker-loader!./build/pdf.worker.js");
+var PdfjsWorker = require("worker-loader?esModule=false!./build/pdf.worker.js");
 
 if (typeof window !== "undefined" && "Worker" in window) {
   pdfjs.GlobalWorkerOptions.workerPort = new PdfjsWorker();