diff --git a/viewer/js/worker.js b/viewer/js/worker.js
index 37fdb706..860385bb 100644
--- a/viewer/js/worker.js
+++ b/viewer/js/worker.js
@@ -1 +1 @@
-import "pdfjs-dist/build/pdf.worker.js";
+import "pdfjs-dist/build/pdf.worker.mjs";