diff --git a/plugins/help/help.php b/plugins/help/help.php
index f2f0d98b9a1..8acf0a3a770 100644
--- a/plugins/help/help.php
+++ b/plugins/help/help.php
@@ -78,6 +78,7 @@ public function action()
             'tablink' => [$this, 'tablink'],
         ]);
 
+        $rcmail->output->set_env('safemode', true);
         $rcmail->output->set_env('help_links', $this->help_metadata());
         $rcmail->output->send(!empty($_GET['_content']) ? 'help.content' : 'help.help');
     }