diff --git a/web/ui/templates/_base.html b/web/ui/templates/_base.html
index 61ddc0454..c9d7f4d06 100644
--- a/web/ui/templates/_base.html
+++ b/web/ui/templates/_base.html
@@ -41,7 +41,7 @@
             <li><a href="{{ pathPrefix }}/graph">Graph</a></li>
             <li><a href="{{ pathPrefix }}/status">Status</a></li>
             <li>
-              <a href="http://prometheus.io" target="_blank">Help</a>
+              <a href="https://prometheus.io" target="_blank">Help</a>
             </li>
           </ul>
         </div>