diff --git a/tests/Models/NullAuditTest.php b/tests/Models/NullAuditTest.php
index a343a10..10a2b62 100755
--- a/tests/Models/NullAuditTest.php
+++ b/tests/Models/NullAuditTest.php
@@ -47,6 +47,6 @@ final class NullAuditTest extends \PHPUnit\Framework\TestCase
     public function testJsonSerialize() : void
     {
         $null = new NullAudit(2);
-        self::assertEquals(['id' => 2], $null);
+        self::assertEquals(['id' => 2], $null->jsonSerialize());
     }
 }