diff --git a/Admin/Routes/Web/Backend.php b/Admin/Routes/Web/Backend.php
index 1f6342d..81cb8bc 100644
--- a/Admin/Routes/Web/Backend.php
+++ b/Admin/Routes/Web/Backend.php
@@ -1,11 +1,10 @@
-<?php
+<?php declare(strict_types=1);
 
 use Modules\AssetManagement\Controller\BackendController;
 use Modules\AssetManagement\Models\PermissionState;
 use phpOMS\Account\PermissionType;
 use phpOMS\Router\RouteVerb;
 
-
 return [
     '^.*/accounting/asset/list.*$' => [
         [
diff --git a/Theme/Backend/Lang/Navigation.en.lang.php b/Theme/Backend/Lang/Navigation.en.lang.php
index 433e559..b76f78c 100644
--- a/Theme/Backend/Lang/Navigation.en.lang.php
+++ b/Theme/Backend/Lang/Navigation.en.lang.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 /**
  * Orange Management
  *
diff --git a/Theme/Backend/Lang/en.lang.php b/Theme/Backend/Lang/en.lang.php
index 82f6409..0275d41 100644
--- a/Theme/Backend/Lang/en.lang.php
+++ b/Theme/Backend/Lang/en.lang.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 /**
  * Orange Management
  *
diff --git a/Theme/Backend/asset-list.tpl.php b/Theme/Backend/asset-list.tpl.php
index 559f971..0bb3664 100644
--- a/Theme/Backend/asset-list.tpl.php
+++ b/Theme/Backend/asset-list.tpl.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 /**
  * Orange Management
  *