diff --git a/src/View/Helper/NumberFormat.php b/src/View/Helper/NumberFormat.php
index d9d909c6..864c7fb5 100644
--- a/src/View/Helper/NumberFormat.php
+++ b/src/View/Helper/NumberFormat.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\I18n\View\Helper;
 
 use Laminas\View\Helper\AbstractHelper;