diff --git a/testing/database.rst b/testing/database.rst
index ed587f3427e..9be53774e8b 100644
--- a/testing/database.rst
+++ b/testing/database.rst
@@ -221,7 +221,7 @@ so, get the entity manager via the service container as follows::
          */
         private $entityManager;
 
-        protected function setUp()
+        protected function setUp(): void
         {
             $kernel = self::bootKernel();
 
@@ -240,7 +240,7 @@ so, get the entity manager via the service container as follows::
             $this->assertSame(14.50, $product->getPrice());
         }
 
-        protected function tearDown()
+        protected function tearDown(): void
         {
             parent::tearDown();