diff --git a/src/Config/Parser/GraphQLParser.php b/src/Config/Parser/GraphQLParser.php
index 8a11d8e80..63bd2cf96 100644
--- a/src/Config/Parser/GraphQLParser.php
+++ b/src/Config/Parser/GraphQLParser.php
@@ -11,6 +11,7 @@
 use GraphQL\Language\AST\NodeKind;
 use GraphQL\Language\AST\ObjectTypeDefinitionNode;
 use GraphQL\Language\Parser;
+use Overblog\GraphQLBundle\Config\Parser\GraphQL\ASTConverter\NodeInterface;
 use SplFileInfo;
 use Symfony\Component\Config\Resource\FileResource;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
@@ -59,6 +60,9 @@ public static function parse(SplFileInfo $file, ContainerBuilder $container, arr
              * @var ObjectTypeDefinitionNode|InputObjectTypeDefinitionNode|EnumTypeDefinitionNode $typeDef
              */
             if (isset($typeDef->kind) && in_array($typeDef->kind, array_keys(self::DEFINITION_TYPE_MAPPING))) {
+                /**
+                 * @var class-string<NodeInterface> $class
+                 */
                 $class = sprintf('\\%s\\GraphQL\\ASTConverter\\%sNode', __NAMESPACE__, ucfirst(self::DEFINITION_TYPE_MAPPING[$typeDef->kind]));
                 $typesConfig[$typeDef->name->value] = call_user_func([$class, 'toConfig'], $typeDef);
             } else {