diff --git a/OptionsResolver.php b/OptionsResolver.php
index bc25463..370fd57 100644
--- a/OptionsResolver.php
+++ b/OptionsResolver.php
@@ -201,7 +201,7 @@ public function setDefault($option, $value)
                 return $this;
             }
 
-            if (isset($params[0]) && null !== ($class = $params[0]->getClass()) && self::class === $class->name && (!isset($params[1]) || (null !== ($class = $params[1]->getClass()) && Options::class === $class->name))) {
+            if (isset($params[0]) && null !== ($type = $params[0]->getType()) && self::class === $type->getName() && (!isset($params[1]) || (null !== ($type = $params[1]->getType()) && Options::class === $type->getName()))) {
                 // Store closure for later evaluation
                 $this->nested[$option][] = $value;
                 $this->defaults[$option] = [];