diff --git a/_includes/sidebar.html b/_includes/sidebar.html
index 854a9f2..396c37e 100644
--- a/_includes/sidebar.html
+++ b/_includes/sidebar.html
@@ -12,9 +12,11 @@
       </p>
       {% endif %}
     </div>
+    {% if page.source %}
     <div class="source">
-      <a href="{{ page.source}}">Source</a>
+      <a href="{{ page.source }}">Source</a>
     </div>
+    {% endif %}
 
      <div class="license-rules license-rules-sidebar">