diff --git a/_includes/ad-footer.html b/_includes/ad-footer.html
index 1628318..61182b3 100644
--- a/_includes/ad-footer.html
+++ b/_includes/ad-footer.html
@@ -1,5 +1,5 @@
 <div class="google-ads" style="margin:10px 0;">
-  <script async src="http://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
+  <script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
   <!-- 320x50 ad -->
   <ins class="adsbygoogle"
        style="display:inline-block;width:320px;height:50px"
diff --git a/_includes/ad-sidebar.html b/_includes/ad-sidebar.html
index efc29d8..8c77555 100644
--- a/_includes/ad-sidebar.html
+++ b/_includes/ad-sidebar.html
@@ -1,5 +1,5 @@
 <div class="google-ads" style="margin-top:40px; text-align:center;">
-  <script async src="http://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
+  <script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
   <!-- 160x600 ad -->
   <ins class="adsbygoogle"
        style="display:inline-block;width:160px;height:600px"