diff --git a/lib/plugins/helper/link_to.js b/lib/plugins/helper/link_to.js
index 0281325b7c..634388dcf0 100644
--- a/lib/plugins/helper/link_to.js
+++ b/lib/plugins/helper/link_to.js
@@ -23,7 +23,7 @@ function linkToHelper(path, text, options) {
 
   if (attrs.external) {
     attrs.target = '_blank';
-    attrs.rel = 'external';
+    attrs.rel = 'noopener';
     attrs.external = null;
   }