diff --git a/tests/Dumb.php b/tests/Dumb.php
index 6e534c7..bda4b8c 100644
--- a/tests/Dumb.php
+++ b/tests/Dumb.php
@@ -16,7 +16,7 @@ class Dumb extends Model
      *
      * @param $data
      */
-    public function __construct($data)
+    public function __construct(string $data = "")
     {
         parent::__construct();
         $this->data = $data;