diff --git a/config/autoload/middleware-pipeline.global.php b/config/autoload/middleware-pipeline.global.php
index 5249b0de..dad75c13 100644
--- a/config/autoload/middleware-pipeline.global.php
+++ b/config/autoload/middleware-pipeline.global.php
@@ -2,6 +2,7 @@
 declare(strict_types=1);
 
 use Shlinkio\Shlink\Common\Middleware\LocaleMiddleware;
+use Shlinkio\Shlink\Core\Response\NotFoundDelegate;
 use Shlinkio\Shlink\Rest\Middleware\BodyParserMiddleware;
 use Shlinkio\Shlink\Rest\Middleware\CheckAuthenticationMiddleware;
 use Shlinkio\Shlink\Rest\Middleware\CrossDomainMiddleware;
@@ -48,7 +49,7 @@ return [
         'post-routing' => [
             'middleware' => [
                 Expressive\Router\Middleware\DispatchMiddleware::class,
-                Expressive\Handler\NotFoundHandler::class,
+                NotFoundDelegate::class,
             ],
             'priority' => 1,
         ],
diff --git a/module/Core/src/Response/NotFoundDelegate.php b/module/Core/src/Response/NotFoundDelegate.php
index 2698625a..db5ab040 100644
--- a/module/Core/src/Response/NotFoundDelegate.php
+++ b/module/Core/src/Response/NotFoundDelegate.php
@@ -39,12 +39,12 @@ class NotFoundDelegate implements DelegateInterface
      */
     public function handle(ServerRequestInterface $request): ResponseInterface
     {
-        $accepts = explode(',', $request->getHeaderLine('Accept'));
-        $accept = array_shift($accepts);
+        $accepts = \explode(',', $request->getHeaderLine('Accept'));
+        $accept = \array_shift($accepts);
         $status = StatusCodeInterface::STATUS_NOT_FOUND;
 
         // If the first accepted type is json, return a json response
-        if (in_array($accept, ['application/json', 'text/json', 'application/x-json'], true)) {
+        if (\in_array($accept, ['application/json', 'text/json', 'application/x-json'], true)) {
             return new Response\JsonResponse([
                 'error' => 'NOT_FOUND',
                 'message' => 'Not found',