diff --git a/public/js/lib/jailed/_frame.js b/public/js/lib/jailed/_frame.js
index 7f464f02de..fa310643fd 100644
--- a/public/js/lib/jailed/_frame.js
+++ b/public/js/lib/jailed/_frame.js
@@ -36,7 +36,7 @@ try {
   blobUrl = blobUrl.getBlob();
 }
 
-var worker = new Worker(URL.createObjectURL('https:' + blobUrl));
+var worker = new Worker(URL.createObjectURL(blobUrl));
 
 // telling worker to load _pluginWeb.js (see blob code above)
 worker.postMessage({