diff --git a/README.md b/README.md
index 0a4cacc..94b1768 100644
--- a/README.md
+++ b/README.md
@@ -58,7 +58,7 @@ Finally, the template needs the support Javascript code added, by calling `paged
     </body>
     </html>
 
-The Javascript classes are imported from a CDN, there are no static files that need to be served by the application.
+The Javascript classes are imported from a CDN, there are no static files that need to be served by the application. If the request is secure then the Javascript files are imported from an https:// URL to match.
 
 To help adding specific CSS styling the `<textarea>` element has class `flask-pagedown-input` and the preview `<div>` has class `flask-pagedown-preview`.
 
diff --git a/flask_pagedown/__init__.py b/flask_pagedown/__init__.py
index 0abd6f5..5c96ceb 100644
--- a/flask_pagedown/__init__.py
+++ b/flask_pagedown/__init__.py
@@ -1,12 +1,16 @@
 from jinja2 import Markup
-from flask import current_app
+from flask import current_app, request
 
 class _pagedown(object):
     def include_pagedown(self):
+        if request.is_secure:
+            protocol = 'https'
+        else:
+            protocol = 'http'
         return Markup('''
-<script type="text/javascript" src="http://cdnjs.cloudflare.com/ajax/libs/pagedown/1.0/Markdown.Converter.min.js"></script>
-<script type="text/javascript" src="http://cdnjs.cloudflare.com/ajax/libs/pagedown/1.0/Markdown.Sanitizer.min.js"></script>
-''')
+<script type="text/javascript" src="{0}://cdnjs.cloudflare.com/ajax/libs/pagedown/1.0/Markdown.Converter.min.js"></script>
+<script type="text/javascript" src="{0}://cdnjs.cloudflare.com/ajax/libs/pagedown/1.0/Markdown.Sanitizer.min.js"></script>
+'''.format(protocol))
 
     def html_head(self):
         return self.include_pagedown()