diff --git a/app/bundles/CoreBundle/Exception/FileNotFoundException.php b/app/bundles/CoreBundle/Exception/FileNotFoundException.php
index 462c8d79629..869228678d8 100644
--- a/app/bundles/CoreBundle/Exception/FileNotFoundException.php
+++ b/app/bundles/CoreBundle/Exception/FileNotFoundException.php
@@ -4,7 +4,7 @@
 
 class FileNotFoundException extends \Exception
 {
-    public function __construct($message = 'File not found.', $code = 0, \Exception $previous = null)
+    public function __construct(string $message = 'File not found.', int $code = 0, \Exception $previous = null)
     {
         parent::__construct($message, $code, $previous);
     }