diff --git a/tests/Integration/Util/IntegrationTestCase.php b/tests/Integration/Util/IntegrationTestCase.php
index fd481ade..a23066ef 100644
--- a/tests/Integration/Util/IntegrationTestCase.php
+++ b/tests/Integration/Util/IntegrationTestCase.php
@@ -105,7 +105,7 @@ protected function deleteDir($dir)
             $links = array_filter(
                 $files,
                 function ($file) {
-                    return $file->getPath() !== $file->getRealPath();
+                    return $file->getPath() !== $file->getRealPath() && ! is_dir( $file->getPath() );
                 }
             );