diff --git a/index.html b/index.html
index ad87d77a..e99eb1d2 100644
--- a/index.html
+++ b/index.html
@@ -161,7 +161,7 @@ console.log(addResult);</div>
     return x;
 }&lt;/div>
     
-&lt;script src="http://d1n0x3qji82z53.cloudfront.net/src-min-noconflict/ace.js" type="text/javascript" charset="utf-8">&lt;/script>
+&lt;script src="//d1n0x3qji82z53.cloudfront.net/src-min-noconflict/ace.js" type="text/javascript" charset="utf-8">&lt;/script>
 &lt;script>
     var editor = ace.edit("editor");
     editor.setTheme("ace/theme/monokai");