diff --git a/src/Util/XdebugFilterScriptGenerator.php b/src/Util/XdebugFilterScriptGenerator.php
index 66c74eee58e..270e0714aaf 100644
--- a/src/Util/XdebugFilterScriptGenerator.php
+++ b/src/Util/XdebugFilterScriptGenerator.php
@@ -50,7 +50,9 @@ private function getWhitelistItems(array $filterData): array
 
         if (isset($filterData['include']['directory'])) {
             foreach ($filterData['include']['directory'] as $directory) {
-                if (\is_string($path = \realpath($directory['path']))) {
+                $path = \realpath($directory['path']);
+
+                if (\is_string($path)) {
                     $files[] = \sprintf('%s/', $path);
                 }
             }