diff --git a/spec/Prophecy/Doubler/Generator/ClassCodeGeneratorSpec.php b/spec/Prophecy/Doubler/Generator/ClassCodeGeneratorSpec.php
index 6f728de6..09fea968 100644
--- a/spec/Prophecy/Doubler/Generator/ClassCodeGeneratorSpec.php
+++ b/spec/Prophecy/Doubler/Generator/ClassCodeGeneratorSpec.php
@@ -116,7 +116,7 @@ class CustomClass extends \RuntimeException implements \Prophecy\Doubler\Generat
 public $name;
 private $email;
 
-public static function getName(array $fullname = NULL, \ReflectionClass $class, object $instance): ?string {
+public static function getName(?array $fullname = NULL, \ReflectionClass $class, object $instance): ?string {
 return $this->name;
 }
 protected  function getEmail(?string $default = 'ever.zet@gmail.com') {
@@ -272,7 +272,7 @@ function it_overrides_properly_methods_with_args_passed_by_reference(
 namespace  {
 class CustomClass extends \RuntimeException implements \Prophecy\Doubler\Generator\MirroredInterface {
 
-public  function getName(array &$fullname = NULL) {
+public  function getName(?array &$fullname = NULL) {
 return $this->name;
 }