diff --git a/tests/Pest.php b/tests/Pest.php
index 476b0591..21393572 100644
--- a/tests/Pest.php
+++ b/tests/Pest.php
@@ -8,7 +8,7 @@
 
 uses(TestCase::class)->in(__DIR__);
 
-function createQueryFromFilterRequest(array $filters, string $model = null): QueryBuilder
+function createQueryFromFilterRequest(array $filters, ?string $model = null): QueryBuilder
 {
     $model ??= TestModel::class;