diff --git a/src/HasParameters.php b/src/HasParameters.php
index 6d4e5a4..03550b0 100644
--- a/src/HasParameters.php
+++ b/src/HasParameters.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace TiMacDonald\Middleware;
 
 use BackedEnum;