diff --git a/Console/Command/PrepareKeysCommand.php b/Console/Command/PrepareKeysCommand.php
index e0bbbda..5ba2213 100644
--- a/Console/Command/PrepareKeysCommand.php
+++ b/Console/Command/PrepareKeysCommand.php
@@ -62,9 +62,9 @@ protected function configure()
      * @param InputInterface  $input
      * @param OutputInterface $output
      *
-     * @return void
+     * @return int
      */
-    protected function execute(InputInterface $input, OutputInterface $output): void
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $phraseCollector = new PhraseCollector(new Tokenizer());
         $adapters = [
@@ -85,5 +85,7 @@ protected function execute(InputInterface $input, OutputInterface $output): void
         }
 
         $output->writeln('<info>Keys successfully created.</info>');
+
+        return 0;
     }
 }