diff --git a/IPython/html/notebookapp.py b/IPython/html/notebookapp.py
index dbec1e3..d84618a 100644
--- a/IPython/html/notebookapp.py
+++ b/IPython/html/notebookapp.py
@@ -516,13 +516,7 @@ class NotebookApp(BaseIPythonApplication):
return url
# no local mathjax, serve from CDN
- if self.certfile:
- # HTTPS: load from Rackspace CDN, because SSL certificate requires it
- host = u"https://c328740.ssl.cf1.rackcdn.com"
- else:
- host = u"http://cdn.mathjax.org"
-
- url = host + u"/mathjax/latest/MathJax.js"
+ url = u"//cdn.mathjax.org/mathjax/latest/MathJax.js"
self.log.info("Using MathJax from CDN: %s", url)
return url