diff --git a/notebook/static/base/js/namespace.js b/notebook/static/base/js/namespace.js
index ab356f695..4296981d3 100644
--- a/notebook/static/base/js/namespace.js
+++ b/notebook/static/base/js/namespace.js
@@ -56,6 +56,8 @@ define(function(){
     jglobal('MarkdownCell','base/js/textcell');
     jglobal('RawCell','base/js/textcell');
     jglobal('Cell','base/js/cell');
+
+    // notebook
     jglobal('OutputArea','notebook/js/outputarea');
     jglobal('KeyboardManager','notebook/js/keyboardmanager');
     jglobal('Completer','notebook/js/completer');
@@ -66,6 +68,9 @@ define(function(){
     jglobal('Pager','notebook/js/pager');
     jglobal('QuickHelp','notebook/js/quickhelp');
 
+    // tree
+    jglobal('SessionList','tree/js/sessionlist');
+
     Jupyter.version = "4.0.0.dev";
     Jupyter._target = '_blank';
     return Jupyter;
diff --git a/notebook/static/tree/js/sessionlist.js b/notebook/static/tree/js/sessionlist.js
index edb5328d9..129d668ed 100644
--- a/notebook/static/tree/js/sessionlist.js
+++ b/notebook/static/tree/js/sessionlist.js
@@ -2,10 +2,9 @@
 // Distributed under the terms of the Modified BSD License.
 
 define([
-    'base/js/namespace',
     'jquery',
     'base/js/utils',
-], function(IPython, $, utils) {
+], function($, utils) {
     "use strict";
 
     var SesssionList = function (options) {
@@ -78,8 +77,5 @@ define([
         this.events.trigger('sessions_loaded.Dashboard', this.sessions);
     };
 
-    // Backwards compatability.
-    IPython.SesssionList = SesssionList;
-
     return {'SesssionList': SesssionList};
 });