diff --git a/bin/Base.php b/bin/Base.php
index 6843559..44b86aa 100644
--- a/bin/Base.php
+++ b/bin/Base.php
@@ -117,7 +117,7 @@ class Base
      * @param $dir
      * @return void
      */
-    protected function scandir($dir)
+    protected function scandir($dir) : void
     {
         $dirFiles = scandir($dir);
         $oldDir   = $dir . DIRECTORY_SEPARATOR;