diff --git a/extension.neon b/extension.neon
index e09d9779..cf080067 100644
--- a/extension.neon
+++ b/extension.neon
@@ -12,7 +12,7 @@ services:
 		class: PHPStan\Symfony\ServiceMapFactory
 		factory: PHPStan\Symfony\XmlServiceMapFactory(%symfony.container_xml_path%)
 	-
-		class: PHPStan\Symfony\ServiceMap(@symfony.serviceMapFactory::create())
+		class: @symfony.serviceMapFactory::create()
 
 	# ControllerTrait::get()/has() return type
 	-
diff --git a/tests/Symfony/NeonTest.php b/tests/Symfony/NeonTest.php
index ad73f9a0..a6fec3f8 100644
--- a/tests/Symfony/NeonTest.php
+++ b/tests/Symfony/NeonTest.php
@@ -24,6 +24,7 @@ public function testExtensionNeon(): void
 
 		$class = $loader->load(function (Compiler $compiler): void {
 			$compiler->addExtension('rules', new RulesExtension());
+			$compiler->addConfig(['parameters' => ['rootDir' => __DIR__]]);
 			$compiler->loadConfig(__DIR__ . '/config.neon');
 			$compiler->loadConfig(__DIR__ . '/../../extension.neon');
 		}, $key);
@@ -31,8 +32,9 @@ public function testExtensionNeon(): void
 		$container = new $class();
 
 		self::assertSame([
+			'rootDir' => __DIR__,
 			'symfony' => [
-				'container_xml_path' => '',
+				'container_xml_path' => __DIR__ . '/container.xml',
 				'constant_hassers' => true,
 			],
 		], $container->getParameters());
@@ -40,6 +42,7 @@ public function testExtensionNeon(): void
 		self::assertCount(2, $container->findByTag('phpstan.rules.rule'));
 		self::assertCount(4, $container->findByTag('phpstan.broker.dynamicMethodReturnTypeExtension'));
 		self::assertCount(3, $container->findByTag('phpstan.typeSpecifier.methodTypeSpecifyingExtension'));
+		self::assertInstanceOf(ServiceMap::class, $container->getByType(ServiceMap::class));
 	}
 
 }
diff --git a/tests/Symfony/config.neon b/tests/Symfony/config.neon
index 22bbecd2..d5787020 100644
--- a/tests/Symfony/config.neon
+++ b/tests/Symfony/config.neon
@@ -1,6 +1,6 @@
 parameters:
 	symfony:
-		container_xml_path: ''
+		container_xml_path: %rootDir%/container.xml
 
 services:
 	- PhpParser\PrettyPrinter\Standard