diff --git a/console/create.php b/console/create.php
index 4581951..3692ac1 100644
--- a/console/create.php
+++ b/console/create.php
@@ -92,7 +92,7 @@ protected function configure()
 	 *
 	 * @throws LogicException When this abstract method is not implemented
 	 */
-	protected function execute(InputInterface $input, OutputInterface $output)
+	protected function execute(InputInterface $input, OutputInterface $output): int
 	{
 		$this->packager->create_extension($this->data);
 
diff --git a/skeleton/console/command/sample.php.twig b/skeleton/console/command/sample.php.twig
index 28fa0b3..20aea26 100644
--- a/skeleton/console/command/sample.php.twig
+++ b/skeleton/console/command/sample.php.twig
@@ -51,7 +51,7 @@ class sample extends \phpbb\console\command\command
 	 * @param InputInterface  $input  An InputInterface instance
 	 * @param OutputInterface $output An OutputInterface instance
 	 */
-	protected function execute(InputInterface $input, OutputInterface $output)
+	protected function execute(InputInterface $input, OutputInterface $output): int
 	{
 		$output->writeln($this->user->lang('CLI_{{ EXTENSION.extension_name|upper }}_HELLO'));
 	}