diff --git a/public/index.php b/public/index.php
index 4e2e452..a511478 100644
--- a/public/index.php
+++ b/public/index.php
@@ -2,11 +2,14 @@
 
 declare(strict_types=1);
 
-require_once __DIR__ . '/../vendor/autoload.php';
+define('PROJECT_ROOT', dirname(__DIR__));
+define('CONFIG_DIRECTORY', PROJECT_ROOT . '/config/');
+
+require_once PROJECT_ROOT . '/vendor/autoload.php';
 
 use Dotenv\Dotenv;
 
-$dotenv = Dotenv::createImmutable(__DIR__ . '/../config', 'PHPStarter.env');
+$dotenv = Dotenv::createImmutable(CONFIG_DIRECTORY, 'PHPStarter.env');
 $dotenv->load();
 
 use PHPStarter\DB;
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 06fdcb4..d0d74a2 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -2,4 +2,6 @@
 
 declare(strict_types=1);
 
-require __DIR__ . '/../vendor/autoload.php';
+define('PROJECT_ROOT', dirname(__DIR__));
+
+require_once PROJECT_ROOT . '/vendor/autoload.php';