diff --git a/layout/_partials/sidebar/site-overview.njk b/layout/_partials/sidebar/site-overview.njk
index 9411517..997e86f 100644
--- a/layout/_partials/sidebar/site-overview.njk
+++ b/layout/_partials/sidebar/site-overview.njk
@@ -67,7 +67,7 @@
         {%- set sidebarURL = link.split('||')[0] | trim %}
         {%- set sidebarIcon = '<i class="' + link.split('||')[1] | trim + ' fa-fw"></i>' if theme.social_icons.enable and link.split('||')[1] else '' %}
         {%- set sidebarText = '' if (theme.social_icons.enable and theme.social_icons.icons_only) else name %}
-        {{ next_url(sidebarURL, sidebarIcon + sidebarText, {title: name + ' → ' + sidebarURL}) }}
+        {{ next_url(sidebarURL, sidebarIcon + sidebarText, {title: name + ' → ' + sidebarURL, rel: 'noopener me'}) }}
       </span>
     {%- endfor %}
   </div>
diff --git a/scripts/helpers/next-url.js b/scripts/helpers/next-url.js
index 5f06921..9cb49cc 100644
--- a/scripts/helpers/next-url.js
+++ b/scripts/helpers/next-url.js
@@ -42,7 +42,7 @@ module.exports = function(path, text, options = {}) {
 
     if (!theme.exturl) {
       // Only for simple link need to rewrite/add attributes.
-      attrs.rel = 'noopener';
+      attrs.rel = attrs.rel || 'noopener';
       attrs.target = '_blank';
     } else {
       // Remove rel attributes for `exturl` in main menu.