diff --git a/js/lightbox_video.js b/js/lightbox_video.js
index d42495348a272862ead4b81888a764cfa96e364b..3b63d9231b54ec9b3aa33c218654af4769204a44 100644
--- a/js/lightbox_video.js
+++ b/js/lightbox_video.js
@@ -86,7 +86,7 @@ Lightvideo = {
       var results = pattern.exec(href);
       if (results !== null) {
         Lightbox.videoId = results[1];
-        var href = "//www.youtube.com/embed/"+Lightbox.videoId;
+        var href = "https://www.youtube.com/embed/"+Lightbox.videoId;
         var variables = 'fs=1';
         if (Lightbox.flvFlashvars.length) {
           variables = variables + '&' + Lightbox.flvFlashvars;