diff --git a/common/lib/xmodule/xmodule/js/src/html/edit.coffee b/common/lib/xmodule/xmodule/js/src/html/edit.coffee
index e678a9b2eb..a69969bf34 100644
--- a/common/lib/xmodule/xmodule/js/src/html/edit.coffee
+++ b/common/lib/xmodule/xmodule/js/src/html/edit.coffee
@@ -1,7 +1,6 @@
 class @HTMLEditingDescriptor
   constructor: (@element) ->
     @edit_box = CodeMirror.fromTextArea($(".edit-box", @element)[0], {
-      mode: "text/html"
       lineNumbers: true
       lineWrapping: true
     })