diff --git a/include/functions.php b/include/functions.php
index 28b7a7c89..7cdeae3b6 100644
--- a/include/functions.php
+++ b/include/functions.php
@@ -2831,10 +2831,13 @@
 
 			if ($site_url) {
 
-				if ($entry->hasAttribute('href'))
+				if ($entry->hasAttribute('href')) {
 					$entry->setAttribute('href',
 						rewrite_relative_url($site_url, $entry->getAttribute('href')));
 
+					$entry->setAttribute('rel', 'noreferrer');
+				}
+
 				if ($entry->hasAttribute('src')) {
 					$src = rewrite_relative_url($site_url, $entry->getAttribute('src'));