diff --git a/tests/QueryTest.php b/tests/QueryTest.php
index 45151ea1e..b790c723b 100644
--- a/tests/QueryTest.php
+++ b/tests/QueryTest.php
@@ -486,9 +486,9 @@ public function testMultipleSortOrder(): void
  * Mockup class to test stringable objects.
  */
 class stringableObject implements Stringable {
-    private $string;
+    private String $string;
 
-    public function __construct($string)
+    public function __construct(String $string)
     {
         $this->string = $string;
     }