diff --git a/system/src/Grav/Common/Service/PagesServiceProvider.php b/system/src/Grav/Common/Service/PagesServiceProvider.php
index 9c51b7d5f..a13684e3a 100644
--- a/system/src/Grav/Common/Service/PagesServiceProvider.php
+++ b/system/src/Grav/Common/Service/PagesServiceProvider.php
@@ -26,7 +26,7 @@ class PagesServiceProvider implements ServiceProviderInterface
             return new Pages($grav);
         };
 
-        if (GRAV_CLI) {
+        if (\defined('GRAV_CLI')) {
             $container['page'] = static function (Grav $grav) {
                 $path = $grav['locator']->findResource('system://pages/notfound.md');
                 $page = new Page();