diff --git a/ArgumentValidator.php b/ArgumentValidator.php
index 74de726..3dc38a5 100644
--- a/ArgumentValidator.php
+++ b/ArgumentValidator.php
@@ -8,6 +8,7 @@
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\ExpressionLanguage;
+use Symfony\Component\DependencyInjection\Parameter;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\ExpressionLanguage\Expression;
 use Symfony\Component\ExpressionLanguage\SyntaxError;
@@ -41,6 +42,10 @@ public function validate(\ReflectionParameter $parameter, $argument)
 
     private function validateArrayArgument($argument)
     {
+        if ($argument instanceof Parameter) {
+            $argument = $this->containerBuilder->getParameter($argument);
+        }
+
         if (!is_array($argument)) {
             throw new TypeHintMismatchException(sprintf(
                 'Argument of type "%s" should have been an array',
diff --git a/ResultingClassResolver.php b/ResultingClassResolver.php
index 58815b5..2c7b423 100644
--- a/ResultingClassResolver.php
+++ b/ResultingClassResolver.php
@@ -4,6 +4,7 @@
 
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
+use Symfony\Component\DependencyInjection\Parameter;
 
 class ResultingClassResolver implements ResultingClassResolverInterface
 {
@@ -18,6 +19,10 @@ public function resolve(Definition $definition)
     {
         $class = $definition->getClass();
 
+        if ($class instanceof Parameter) {
+            $class = $this->containerBuilder->getParameter($class);
+        }
+
         return $this->resolvePlaceholders($class);
     }
 
diff --git a/Tests/ResultingClassResolverTest.php b/Tests/ResultingClassResolverTest.php
index 48cb6c6..a9a9e32 100644
--- a/Tests/ResultingClassResolverTest.php
+++ b/Tests/ResultingClassResolverTest.php
@@ -5,6 +5,7 @@
 use Matthias\SymfonyServiceDefinitionValidator\ResultingClassResolver;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
+use Symfony\Component\DependencyInjection\Parameter;
 
 class ResultingClassResolverTest extends \PHPUnit_Framework_TestCase
 {
@@ -21,13 +22,16 @@ public function testResolvesClassOfDefinition()
     {
         $containerBuilder = new ContainerBuilder();
         $containerBuilder->setParameter('definition.class', 'stdClass');
+        $containerBuilder->setParameter('definition2.class', 'stdClass');
 
         $resolver = new ResultingClassResolver($containerBuilder);
 
         $definition = new Definition('%definition.class%');
-
         $resolvedClass = $resolver->resolve($definition);
+        $this->assertSame('stdClass', $resolvedClass);
 
+        $definition2 = new Definition(new Parameter('definition2.class'));
+        $resolvedClass = $resolver->resolve($definition2);
         $this->assertSame('stdClass', $resolvedClass);
     }
 }