diff --git a/testing/database.rst b/testing/database.rst
index 3f7ce3704f8..0f19ee89b41 100644
--- a/testing/database.rst
+++ b/testing/database.rst
@@ -99,7 +99,7 @@ so, get the entity manager via the service container as follows::
 
     class ProductRepositoryTest extends KernelTestCase
     {
-        private EntityManager $entityManager;
+        private ?EntityManager $entityManager;
 
         protected function setUp(): void
         {