diff --git a/src/Console/Application.php b/src/Console/Application.php
index c86a1f20..d777d4e1 100644
--- a/src/Console/Application.php
+++ b/src/Console/Application.php
@@ -77,7 +77,7 @@ protected function getDefaultInputDefinition(): Console\Input\InputDefinition
         return $inputDefinition;
     }
 
-    public function doRun(Console\Input\InputInterface $input, Console\Output\OutputInterface $output)
+    public function doRun(Console\Input\InputInterface $input, Console\Output\OutputInterface $output): int
     {
         $this->input = $input;