diff --git a/lib/Controller/OccOutput.php b/lib/Controller/OccOutput.php
index 0ceff97..4afe826 100644
--- a/lib/Controller/OccOutput.php
+++ b/lib/Controller/OccOutput.php
@@ -35,7 +35,7 @@ class OccOutput extends BufferedOutput implements ConsoleOutputInterface
     );
   }
 
-  public function fetch()
+  public function fetch(): string
   {
     // Получаем основной буфер
     $content = parent::fetch();