diff --git a/.php-cs-fixer.php b/.php-cs-fixer.php
index e9134432..4117e42d 100644
--- a/.php-cs-fixer.php
+++ b/.php-cs-fixer.php
@@ -85,6 +85,7 @@
         PhpCsFixer\Finder::create()
             ->exclude('vendor')
             ->exclude('bin')
+            ->exclude('runtime')
             ->in(__DIR__)
     )
     ->setUsingCache(false);