diff --git a/IPython/html/static/notebook/js/codecell.js b/IPython/html/static/notebook/js/codecell.js
index 9b32496..c248fc1 100644
--- a/IPython/html/static/notebook/js/codecell.js
+++ b/IPython/html/static/notebook/js/codecell.js
@@ -63,7 +63,6 @@ var IPython = (function (IPython) {
     var CodeCell = function (kernel, options) {
         this.kernel = kernel || null;
         this.collapsed = false;
-        this.cell_type = "code";
 
         // create all attributed in constructor function
         // even if null for V8 VM optimisation
@@ -82,6 +81,9 @@ var IPython = (function (IPython) {
 
         IPython.Cell.apply(this,[options]);
 
+        // Attributes we want to override in this subclass.
+        this.cell_type = "code";
+
         var that = this;
         this.element.focusout(
             function() { that.auto_highlight(); }