diff --git a/tests/Fixtures/ConfigurationResolverConfigFile/case_4/my.php-cs-fixer.php b/tests/Fixtures/ConfigurationResolverConfigFile/case_4/my.php-cs-fixer.php
index c3160518eb9..df5d038eb5c 100644
--- a/tests/Fixtures/ConfigurationResolverConfigFile/case_4/my.php-cs-fixer.php
+++ b/tests/Fixtures/ConfigurationResolverConfigFile/case_4/my.php-cs-fixer.php
@@ -1,6 +1,6 @@
 <?php
 
-if (!class_exists('Test4Config')) {
+if (!class_exists(\Test4Config::class)) {
     class Test4Config extends PhpCsFixer\Config {}
 }