diff --git a/lib/Command/Generate.php b/lib/Command/Generate.php
index 34a001d..723a3ea 100644
--- a/lib/Command/Generate.php
+++ b/lib/Command/Generate.php
@@ -66,8 +66,10 @@ protected function configure() {
 	/**
 	 * @param InputInterface $input
 	 * @param OutputInterface $output
+	 * @return int
+	 * @throws \Exception
 	 */
-	protected function execute(InputInterface $input, OutputInterface $output) {
+	protected function execute(InputInterface $input, OutputInterface $output): int {
 		$user = $input->getOption('user');
 		$group = $input->getOption('group');
 		if ($user === null && $group === null) {
diff --git a/lib/Command/RepairNotifications.php b/lib/Command/RepairNotifications.php
index db9092c..20e91b7 100644
--- a/lib/Command/RepairNotifications.php
+++ b/lib/Command/RepairNotifications.php
@@ -58,7 +58,7 @@ protected function configure() {
 	 * @param OutputInterface $output
 	 * @return int
 	 */
-	protected function execute(InputInterface $input, OutputInterface $output) {
+	protected function execute(InputInterface $input, OutputInterface $output): int {
 		$subject = $input->getArgument('subject');
 
 		if (!\in_array($subject, self::$availableSubjects)) {