diff --git a/uninstall.php b/uninstall.php
index 710f6c4..7e8ad50 100644
--- a/uninstall.php
+++ b/uninstall.php
@@ -2,6 +2,8 @@
 
 use OpenIDConnectServer\OpenIDConnectServer;
 
+require_once __DIR__ . '/vendor/autoload.php';
+
 // if uninstall.php is not called by WordPress, die.
 if ( ! defined( 'WP_UNINSTALL_PLUGIN' ) ) {
 	die;