diff --git a/notebook/static/notebook/js/menubar.js b/notebook/static/notebook/js/menubar.js
index 6ae6fc785..ae4a432af 100644
--- a/notebook/static/notebook/js/menubar.js
+++ b/notebook/static/notebook/js/menubar.js
@@ -402,7 +402,7 @@ define([
                 .append($("<a>")
                     .attr('target', '_blank')
                     .attr('title', 'Opens in a new window')
-                    .attr('href', link.url)
+                    .attr('href', require.toUrl(link.url))
                     .append($("<i>")
                         .addClass("fa fa-external-link menu-icon pull-right")
                     )