diff --git a/TODO.rst b/TODO.rst
index 7eebbef1..2f4f5224 100644
--- a/TODO.rst
+++ b/TODO.rst
@@ -12,12 +12,12 @@ TODO before final release
 
 - fix issues with portal types vocabularies
 - integrate work done at TU Dresden
-- fix warning with @@ckeditor_vars.js (text/plain MIME type)
 - remove references to Flash (do not forget quickupload)
 
 Done
 ----
 
+- fix warning with @@ckeditor_vars.js (text/plain MIME type)
 - hide form.widgets.IRichTextBehavior.text_text_format
 - hide profiles that should be hidden in ckeditor
 - ckeditor_vars depends on plone
diff --git a/docs/HISTORY.txt b/docs/HISTORY.txt
index 7e1f2e49..1644b509 100644
--- a/docs/HISTORY.txt
+++ b/docs/HISTORY.txt
@@ -4,6 +4,9 @@ Changelog
 5.0.0a6 (unreleased)
 --------------------
 
+- Fix warning with @@ckeditor_vars.js (text/plain MIME type)
+  [gotcha]
+
 - Hide plone.app.textfield text format select.
   [gotcha]
 
diff --git a/src/collective/ckeditor/browser/ckeditorview.py b/src/collective/ckeditor/browser/ckeditorview.py
index dd57ae6f..64997426 100644
--- a/src/collective/ckeditor/browser/ckeditorview.py
+++ b/src/collective/ckeditor/browser/ckeditorview.py
@@ -449,8 +449,8 @@ def getCK_plone_config(self):
 
     def getCK_vars(self):
         request = self.request
-        response = request.RESPONSE
-        # response.setHeader('Content-Type', 'application/x-javascript')
+        response = request.response
+        response.setHeader('Content-Type', 'text/javascript')
         return CK_VARS_TEMPLATE % {'portal_url': self.portal_url}
 
     def getCustomTemplatesConfig(self, customTemplates):