diff --git a/_includes/head/custom.html b/_includes/head/custom.html
index 769bab72b..9a2148c82 100644
--- a/_includes/head/custom.html
+++ b/_includes/head/custom.html
@@ -2,6 +2,12 @@
 {% include base_path %}
 <!-- insert favicons. use http://realfavicongenerator.net/ -->
 
+<script type="text/javascript">
+    var host = "3ds.guide";
+    if ((host == window.location.host) && (window.location.protocol != "https:"))
+        window.location.protocol = "https";
+</script>
+
 <script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
 <script>
   (adsbygoogle = window.adsbygoogle || []).push({