diff --git a/.php-cs-fixer.dist.php b/.php-cs-fixer.dist.php
index 77d4b53..074f5ea 100644
--- a/.php-cs-fixer.dist.php
+++ b/.php-cs-fixer.dist.php
@@ -57,5 +57,6 @@
         'phpdoc_align' => [],
         'phpdoc_to_comment' => false,
         'single_line_comment_spacing' => false,
+        'nullable_type_declaration_for_default_null_value' => true,
     ])
 ;