diff --git a/IPython/html/static/notebook/js/codecell.js b/IPython/html/static/notebook/js/codecell.js
index e37cfe4..a7bc26a 100644
--- a/IPython/html/static/notebook/js/codecell.js
+++ b/IPython/html/static/notebook/js/codecell.js
@@ -46,7 +46,6 @@ var IPython = (function (IPython) {
var utils = IPython.utils;
var key = IPython.utils.keycodes;
- CodeMirror.modeURL = "/static/components/codemirror/mode/%N/%N.js";
/**
* A Cell conceived to write code.
diff --git a/IPython/html/templates/notebook.html b/IPython/html/templates/notebook.html
index 6662c68..b52bae9 100644
--- a/IPython/html/templates/notebook.html
+++ b/IPython/html/templates/notebook.html
@@ -204,6 +204,9 @@ class="notebook_app"
{{super()}}
+