diff --git a/tests/system/CodeIgniterTest.php b/tests/system/CodeIgniterTest.php
index 64b6f491fabf..3e740aba2af5 100644
--- a/tests/system/CodeIgniterTest.php
+++ b/tests/system/CodeIgniterTest.php
@@ -26,6 +26,7 @@
 use Config\Modules;
 use Config\Routing;
 use Tests\Support\Filters\Customfilter;
+use Tests\Support\Filters\RedirectFilter;
 
 /**
  * @backupGlobals enabled
@@ -941,6 +942,12 @@ public function testRunControllerNotFoundBeforeFilter(): void
         $routes = Services::routes();
         $routes->setAutoRoute(true);
 
+        // Inject the before filter.
+        $filterConfig                            = config('Filters');
+        $filterConfig->aliases['redirectFilter'] = RedirectFilter::class;
+        $filterConfig->globals['before']         = ['redirectFilter'];
+        Services::filters($filterConfig);
+
         $this->expectException(PageNotFoundException::class);
 
         $this->codeigniter->run($routes);