diff --git a/app/routes.php b/app/routes.php
index c0ad7868..3d7a66e8 100644
--- a/app/routes.php
+++ b/app/routes.php
@@ -7,7 +7,7 @@
 	routesInDirectory();
 
 	function routesInDirectory($app = '') {
-		$routeDir = app_path('routes/' . $app . ($app !== '' ? '/' : NULL));
+		$routeDir = app_path('routes/' . $app . ($app !== '' ? '/' : null));
 		$iterator = new RecursiveDirectoryIterator($routeDir);
 		$iterator->setFlags(RecursiveDirectoryIterator::SKIP_DOTS);