diff --git a/addons/web/static/src/js/widgets/sidebar.js b/addons/web/static/src/js/widgets/sidebar.js
index 9b7d223335fc43bfc81b38799b454d57ec73cc61..9ea15be128b216f9bcb4caa24e237d1b751bcf14 100644
--- a/addons/web/static/src/js/widgets/sidebar.js
+++ b/addons/web/static/src/js/widgets/sidebar.js
@@ -179,7 +179,7 @@ var Sidebar = Widget.extend({
         _.each(attachments,function(a) {
             a.label = a.name;
             if(a.type === "binary") {
-                a.url = '/web/content/'  + a.id + '?download=true&t=' + (new Date().getTime());
+                a.url = '/web/content/'  + a.id + '?download=true';
             }
         });
         this.items.files = attachments;