diff --git a/src/Pest.php b/src/Pest.php
index 43b88c93..aa9c80c1 100644
--- a/src/Pest.php
+++ b/src/Pest.php
@@ -11,5 +11,5 @@ function version(): string
 
 function testDirectory(string $file = ''): string
 {
-    return TestSuite::getInstance()->testPath.'/'.$file;
+    return TestSuite::getInstance()->testPath.DIRECTORY_SEPARATOR.$file;
 }