diff --git a/tests/Functional/DefaultValue/DefaultValueTest.php b/tests/Functional/DefaultValue/DefaultValueTest.php
index dcaca0f4a..754037fe5 100644
--- a/tests/Functional/DefaultValue/DefaultValueTest.php
+++ b/tests/Functional/DefaultValue/DefaultValueTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Overblog\GraphQLBundle\Tests\Functional\DefaultValue;
 
 use Overblog\GraphQLBundle\Tests\Functional\TestCase;