diff --git a/composer.json b/composer.json
index 08f5b685..5b5438ff 100644
--- a/composer.json
+++ b/composer.json
@@ -26,8 +26,10 @@
 "phpstan/phpstan-phpunit": "^1.0",
 "phpstan/phpstan-strict-rules": "^1.0",
 "phpunit/phpunit": "^9.5",
+ "psr/container": "1.0 || 1.1.1",
 "symfony/config": "^4.2 || ^5.0",
 "symfony/console": "^4.0 || ^5.0",
+ "symfony/dependency-injection": "^4.0 || ^5.0",
 "symfony/form": "^4.0 || ^5.0",
 "symfony/framework-bundle": "^4.4 || ^5.0",
 "symfony/http-foundation": "^5.1",
diff --git a/src/Type/Symfony/ServiceDynamicReturnTypeExtension.php b/src/Type/Symfony/ServiceDynamicReturnTypeExtension.php
index 04608c17..cd3d2a46 100644
--- a/src/Type/Symfony/ServiceDynamicReturnTypeExtension.php
+++ b/src/Type/Symfony/ServiceDynamicReturnTypeExtension.php
@@ -8,11 +8,14 @@
 use PHPStan\Reflection\ParametersAcceptorSelector;
 use PHPStan\ShouldNotHappenException;
 use PHPStan\Symfony\Configuration;
+use PHPStan\Symfony\ParameterMap;
+use PHPStan\Symfony\ServiceDefinition;
 use PHPStan\Symfony\ServiceMap;
 use PHPStan\Type\Constant\ConstantBooleanType;
 use PHPStan\Type\DynamicMethodReturnTypeExtension;
 use PHPStan\Type\ObjectType;
 use PHPStan\Type\Type;
+use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
 use function in_array;
 
 final class ServiceDynamicReturnTypeExtension implements DynamicMethodReturnTypeExtension
@@ -27,11 +30,20 @@ final class ServiceDynamicReturnTypeExtension implements DynamicMethodReturnType
 	/** @var ServiceMap */
 	private $serviceMap;
 
-	public function __construct(string $className, Configuration $configuration, ServiceMap $symfonyServiceMap)
+	/** @var ParameterBag */
+	private $parameterBag;
+
+	public function __construct(
+		string $className,
+		Configuration $configuration,
+		ServiceMap $symfonyServiceMap,
+		ParameterMap $symfonyParameterMap
+	)
 	{
 		$this->className = $className;
 		$this->constantHassers = $configuration->hasConstantHassers();
 		$this->serviceMap = $symfonyServiceMap;
+		$this->parameterBag = $this->createParameterBag($symfonyParameterMap);
 	}
 
 	public function getClass(): string
@@ -70,7 +82,7 @@ private function getGetTypeFromMethodCall(
 		if ($serviceId !== null) {
 			$service = $this->serviceMap->getService($serviceId);
 			if ($service !== null && (!$service->isSynthetic() || $service->getClass() !== null)) {
-				return new ObjectType($service->getClass() ?? $serviceId);
+				return new ObjectType($this->determineServiceClass($service) ?? $serviceId);
 			}
 		}
 
@@ -97,4 +109,20 @@ private function getHasTypeFromMethodCall(
 		return $returnType;
 	}
 
+	private function determineServiceClass(ServiceDefinition $service): ?string
+	{
+		return $this->parameterBag->resolveValue($service->getClass());
+	}
+
+	private function createParameterBag(ParameterMap $symfonyParameterMap): ParameterBag
+	{
+		$parameters = [];
+
+		foreach ($symfonyParameterMap->getParameters() as $parameterDefinition) {
+			$parameters[$parameterDefinition->getKey()] = $parameterDefinition->getValue();
+		}
+
+		return new ParameterBag($parameters);
+	}
+
 }
diff --git a/tests/Type/Symfony/container.xml b/tests/Type/Symfony/container.xml
index e6f8f03b..992289f2 100644
--- a/tests/Type/Symfony/container.xml
+++ b/tests/Type/Symfony/container.xml
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <container xmlns="http://symfony.com/schema/dic/services" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">
 <parameters>
+ <parameter key="app.class">Foo</parameter>
 <parameter key="app.string">abcdef</parameter>
 <parameter key="app.int">123</parameter>
 <parameter key="app.int_as_string" type="string">123</parameter>
@@ -51,6 +52,8 @@
 
 <services>
 <service id="foo" public="true"></service>
+ 
+ 
 <service id="synthetic" public="true" synthetic="true" />
 </services>
 </container>
diff --git a/tests/Type/Symfony/data/ExampleAbstractController.php b/tests/Type/Symfony/data/ExampleAbstractController.php
index 6dc6ef7e..6fdb281d 100644
--- a/tests/Type/Symfony/data/ExampleAbstractController.php
+++ b/tests/Type/Symfony/data/ExampleAbstractController.php
@@ -13,6 +13,8 @@ final class ExampleAbstractController extends AbstractController
 	public function services(): void
 	{
 		assertType('Foo', $this->get('foo'));
+		assertType('Foo', $this->get('parameterised_foo'));
+		assertType('Foo\Bar', $this->get('parameterised_bar'));
 		assertType('Synthetic', $this->get('synthetic'));
 		assertType('object', $this->get('bar'));
 		assertType('object', $this->get(doFoo()));
diff --git a/tests/Type/Symfony/data/ExampleController.php b/tests/Type/Symfony/data/ExampleController.php
index 8cd0c93a..b09cc25d 100644
--- a/tests/Type/Symfony/data/ExampleController.php
+++ b/tests/Type/Symfony/data/ExampleController.php
@@ -13,6 +13,8 @@ final class ExampleController extends Controller
 	public function services(): void
 	{
 		assertType('Foo', $this->get('foo'));
+		assertType('Foo', $this->get('parameterised_foo'));
+		assertType('Foo\Bar', $this->get('parameterised_bar'));
 		assertType('Synthetic', $this->get('synthetic'));
 		assertType('object', $this->get('bar'));
 		assertType('object', $this->get(doFoo()));
</div><div class="naked_ctrl">
<form action="/index.cgi/contrast" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="https://patch-diff.githubusercontent.com/raw/phpstan/phpstan-symfony/pull/254.diff">(-&gt;オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="https://patch-diff.githubusercontent.com/raw/phpstan/phpstan-symfony/pull/254.diff" size="22" /></label> <label>モード: <select name="naked_post_mode">
<option value="default">デフォルト</option>
<option value="speech">音声ブラウザ</option>
<option value="ruby">ルビ付き</option>
<option value="contrast" selected="selected">配色反転</option>
<option value="larger-text">文字拡大</option>
<option value="mobile">モバイル</option>
</select>
<input type="submit" value="表示" />
</p>
</form>
</div>