--- js/twitter_button.js	2013-06-15 15:39:53.516506718 +0200
+++ js/twitter_button.js	2013-06-17 17:52:34.382361500 +0200
@@ -9,7 +9,7 @@
         $('a.service-links-twitter-widget', context).each(function(){
           $(this).attr('href', $(this).attr('href').replace(/((?:counturl\=|^))http[s]*\%3A\/\//g, "$1"));
         });
-        $.getScript('http://platform.twitter.com/widgets.js', function () {
+        $.getScript(window.location.protocol + '//platform.twitter.com/widgets.js', function () {
           this.scriptadded = true;
         });
       }