diff --git a/src/function.php b/src/function.php
index 2e9a77f..2b1c8a3 100644
--- a/src/function.php
+++ b/src/function.php
@@ -1,5 +1,8 @@
 <?php
 
+declare(strict_types=1);
+
+use Psr\Http\Message\ResponseInterface;
 use Kiri\Router\Blade\BladeFactory;
 use Kiri\Router\Blade\BladeHelper;