diff --git a/src/worker/worker.js b/src/worker/worker.js
index 14ec37a0..8894c50d 100644
--- a/src/worker/worker.js
+++ b/src/worker/worker.js
@@ -28,7 +28,7 @@
  * @module worker/worker
  */
 
-self.window = {}; // to make UMD bundles work
+self.window = self; // to make UMD bundles work
 
 importScripts('openpgp.js');
 var openpgp = window.openpgp;