diff --git a/templates/main.html b/templates/main.html
index e35715a..d39d1a9 100644
--- a/templates/main.html
+++ b/templates/main.html
@@ -18,7 +18,7 @@ $# License along with Hypo.  If not, see <http://www.gnu.org/licenses/>.
 <html>
   <head>
     <title>Hypo: $file.filename</title>
-    <link href="http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/2.3.2/css/bootstrap.min.css"
+    <link href="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/2.3.2/css/bootstrap.min.css"
           type="text/css" rel="stylesheet" />
     <style>$:style</style>
     <meta name="robots" content="noindex, nofollow">
