diff --git a/.php_cs b/.php_cs
index be623c27..0c58b541 100644
--- a/.php_cs
+++ b/.php_cs
@@ -11,6 +11,7 @@ return $config->setRules([
         '@PSR12' => true,
         'fully_qualified_strict_types' => true,
         'array_syntax' => ['syntax' => 'short'],
+        'visibility_required' => ['property', 'method'],// 'const' is removed for old PHP compat
     ])
     ->setFinder($finder)
 ;