diff --git a/securemail/securemail.php b/securemail/securemail.php
index 50bd2722..5662714b 100644
--- a/securemail/securemail.php
+++ b/securemail/securemail.php
@@ -15,7 +15,7 @@ use Friendica\Core\PConfig;
 use Friendica\Core\Renderer;
 use Friendica\Util\Emailer;
 
-require_once 'vendor/autoload.php';
+require_once __DIR__ . '/vendor/autoload.php';
 
 function securemail_install()
 {