diff --git a/app/assets/javascripts/pdf/index.vue b/app/assets/javascripts/pdf/index.vue
index cdf1257b4e3..dc5f9ba9607 100644
--- a/app/assets/javascripts/pdf/index.vue
+++ b/app/assets/javascripts/pdf/index.vue
@@ -28,7 +28,7 @@ export default {
   },
   watch: { pdf: 'load' },
   mounted() {
-    pdfjsLib.PDFJS.workerSrc = workerSrc;
+    pdfjsLib.GlobalWorkerOptions.workerSrc = workerSrc;
     if (this.hasPDF) this.load();
   },
   methods: {