diff --git a/assets/scripts/ajaxupload.js b/assets/scripts/ajaxupload.js
index 825e022ae6a..851f2e62d5f 100644
--- a/assets/scripts/ajaxupload.js
+++ b/assets/scripts/ajaxupload.js
@@ -509,7 +509,6 @@
             // "This page contains both secure and nonsecure items"
             // Anyway, it doesn't do any harm.
             iframe.setAttribute('id', id);
-            iframe.setAttribute('srcdoc', this._settings.action);
 
             iframe.style.display = 'none';
             document.body.appendChild(iframe);