diff --git a/src/GraphQl/Type/TypesContainerInterface.php b/src/GraphQl/Type/TypesContainerInterface.php
index c8ce6dee90f..8b531411bf5 100644
--- a/src/GraphQl/Type/TypesContainerInterface.php
+++ b/src/GraphQl/Type/TypesContainerInterface.php
@@ -40,7 +40,7 @@ public function set(string $id, GraphQLType $type): void;
      *
      * @return GraphQLType The type found in the container
      */
-    public function get(string $id): GraphQLType;
+    public function get($id): GraphQLType;
 
     /**
      * Gets all the types.
@@ -56,5 +56,5 @@ public function all(): array;
      *
      * @return bool true if the type is present, false otherwise
      */
-    public function has(string $id): bool;
+    public function has($id): bool;
 }
diff --git a/tests/Symfony/Bundle/DependencyInjection/ApiPlatformExtensionTest.php b/tests/Symfony/Bundle/DependencyInjection/ApiPlatformExtensionTest.php
index 4e72f6dd346..b0e332f3831 100644
--- a/tests/Symfony/Bundle/DependencyInjection/ApiPlatformExtensionTest.php
+++ b/tests/Symfony/Bundle/DependencyInjection/ApiPlatformExtensionTest.php
@@ -118,7 +118,8 @@ class ApiPlatformExtensionTest extends TestCase
         'enable_docs' => true,
     ]];
 
-    private ContainerBuilder $container;
+    /** @var ContainerBuilder */
+    private $container;
 
     protected function setUp(): void
     {