diff --git a/lib/Command/SelfTest.php b/lib/Command/SelfTest.php
index 7e093ca..525b770 100644
--- a/lib/Command/SelfTest.php
+++ b/lib/Command/SelfTest.php
@@ -37,7 +37,7 @@ protected function configure() {
 		parent::configure();
 	}
 
-	protected function execute(InputInterface $input, OutputInterface $output) {
+	protected function execute(InputInterface $input, OutputInterface $output): int {
 		$server = $this->config->getAppValue('notify_push', 'base_endpoint', '');
 		if (!$server) {
 			$output->writeln('<error>🗴 no push server configured</error>');
diff --git a/lib/Command/Setup.php b/lib/Command/Setup.php
index 501bf55..216b2bd 100644
--- a/lib/Command/Setup.php
+++ b/lib/Command/Setup.php
@@ -42,7 +42,7 @@ protected function configure() {
 		parent::configure();
 	}
 
-	protected function execute(InputInterface $input, OutputInterface $output) {
+	protected function execute(InputInterface $input, OutputInterface $output): int {
 		$server = $input->getArgument('server');
 		if ($server) {
 			$result = $this->test->test($server, $output);