diff --git a/src/Symfony/Component/Messenger/Transport/Doctrine/Connection.php b/src/Symfony/Component/Messenger/Transport/Doctrine/Connection.php
index ffb1d13779..aadcb2fadc 100644
--- a/src/Symfony/Component/Messenger/Transport/Doctrine/Connection.php
+++ b/src/Symfony/Component/Messenger/Transport/Doctrine/Connection.php
@@ -29,7 +29,7 @@ use Symfony\Component\Messenger\Exception\TransportException;
  */
 class Connection
 {
-    const DEFAULT_OPTIONS = [
+    private const DEFAULT_OPTIONS = [
         'table_name' => 'messenger_messages',
         'queue_name' => 'default',
         'redeliver_timeout' => 3600,