diff --git a/phpstan.neon b/phpstan.neon
index 3be61f5..0f02e57 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -11,3 +11,6 @@ parameters:
     - src
   tmpDir: vendor/.cache.phpstan
   reportUnmatchedIgnoredErrors: false
+  ignoreErrors:
+    # Symfony polyfill bug
+    - '/^Access to property \$\w+ of internal class Symfony\\Polyfill\\Php80\\PhpToken from outside its root namespace Symfony/'
diff --git a/src/Mapping/Driver/ReflectionDriver.php b/src/Mapping/Driver/ReflectionDriver.php
index 8a78ee7..705cc8a 100644
--- a/src/Mapping/Driver/ReflectionDriver.php
+++ b/src/Mapping/Driver/ReflectionDriver.php
@@ -40,6 +40,15 @@ protected function load(
             $this->fillDefaultValue($property, $metadata);
         }
 
+        $this->loadParametersFor($class, $reflection);
+    }
+
+    /**
+     * @param ClassMetadata<object> $class
+     * @param \ReflectionClass<object> $reflection
+     */
+    private function loadParametersFor(ClassMetadata $class, \ReflectionClass $reflection): void
+    {
         $constructor = $reflection->getConstructor();
 
         if ($constructor === null) {
@@ -57,6 +66,12 @@ protected function load(
                 $metadata->setDefaultValue($parameter->getDefaultValue());
             }
         }
+
+        $parent = $reflection->getParentClass();
+
+        if ($parent instanceof \ReflectionClass) {
+            $this->loadParametersFor($class, $parent);
+        }
     }
 
     private function fillDefaultValue(\ReflectionProperty $property, PropertyMetadata $meta): void
diff --git a/src/Runtime/Value/SymfonyValuePrinter.php b/src/Runtime/Value/SymfonyValuePrinter.php
index 8805b93..a9c404a 100644
--- a/src/Runtime/Value/SymfonyValuePrinter.php
+++ b/src/Runtime/Value/SymfonyValuePrinter.php
@@ -51,6 +51,7 @@ public function dump(Data $data, $output = null): ?string
     private function createDefaultVarCloner(): VarCloner
     {
         $cloner = new VarCloner();
+        /** @phpstan-ignore-next-line Allow internal class usage */
         $cloner->addCasters(ReflectionCaster::UNSET_CLOSURE_FILE_INFO);
 
         return $cloner;