diff --git a/jupyter_notebook/static/notebook/js/keyboardmanager.js b/jupyter_notebook/static/notebook/js/keyboardmanager.js
index 883c5f308..be2171b27 100644
--- a/jupyter_notebook/static/notebook/js/keyboardmanager.js
+++ b/jupyter_notebook/static/notebook/js/keyboardmanager.js
@@ -188,6 +188,7 @@ define([
     };
 
     KeyboardManager.prototype.register_events = function (e) {
+        e = $(e);
         var that = this;
         var handle_focus = function () {
             that.disable();