diff --git a/lib/site_template/_includes/head.html b/lib/site_template/_includes/head.html
index e94bb982..ef54e080 100644
--- a/lib/site_template/_includes/head.html
+++ b/lib/site_template/_includes/head.html
@@ -4,6 +4,7 @@
     <title>{% if page.title %}{{ page.title }}{% else %}{{ site.name }}{% endif %}</title>
     <meta name="viewport" content="width=device-width">
     <meta name="description" content="{{ site.description }}" />
+    <link rel="canonical" href="{{ site.url }}{{ page.url | replace:'index.html','' }}/" />
 
     <!-- syntax highlighting CSS -->
     <link rel="stylesheet" href="/css/syntax.css">