diff --git a/index.html b/index.html
index fffb539..e508218 100644
--- a/index.html
+++ b/index.html
@@ -72,7 +72,7 @@
     <meta name="description" content="impress.js is a presentation tool based on the power of CSS3 transforms and transitions in modern browsers and inspired by the idea behind prezi.com." />
     <meta name="author" content="Bartek Szopka" />
 
-    <link href="http://fonts.googleapis.com/css?family=Open+Sans:regular,semibold,italic,italicsemibold|PT+Sans:400,700,400italic,700italic|PT+Serif:400,700,400italic,700italic" rel="stylesheet" />
+    <link href="//fonts.googleapis.com/css?family=Open+Sans:regular,semibold,italic,italicsemibold|PT+Sans:400,700,400italic,700italic|PT+Serif:400,700,400italic,700italic" rel="stylesheet" />
 
     <!--