diff --git a/GiiController.php b/GiiController.php
index 2c8c4b9..4e98ac8 100644
--- a/GiiController.php
+++ b/GiiController.php
@@ -52,6 +52,9 @@ class GiiController extends GiiBase
         $controller = str_replace('\\\\', '\\', "$namespace\\{$managerName}Controller");
 
         $html = "<?php
+
+declare(strict_types=1);
+
 namespace {$namespace};
 
 ";
diff --git a/GiiModel.php b/GiiModel.php
index b5a9f3c..15aa864 100644
--- a/GiiModel.php
+++ b/GiiModel.php
@@ -72,6 +72,9 @@ namespace ' . $namespace . ';
 
         if (empty($html)) {
             $html = '<?php
+
+declare(strict_types=1);
+
 namespace ' . $namespace . ';