diff --git a/Classes/Command/BoostQueueCommand.php b/Classes/Command/BoostQueueCommand.php
index 966b3926d2c..287f938ec73 100644
--- a/Classes/Command/BoostQueueCommand.php
+++ b/Classes/Command/BoostQueueCommand.php
@@ -62,7 +62,7 @@ protected function configure(): void
      *
      * @see setCode()
      */
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $io = new SymfonyStyle($input, $output);
 
diff --git a/Classes/Command/FlushCacheCommand.php b/Classes/Command/FlushCacheCommand.php
index c9c7b69dcb7..85bb5a4a4f2 100644
--- a/Classes/Command/FlushCacheCommand.php
+++ b/Classes/Command/FlushCacheCommand.php
@@ -44,7 +44,7 @@ protected function configure(): void
      *
      * @see setCode()
      */
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         $cacheService = GeneralUtility::makeInstance(CacheService::class);
         $cacheService->flush((bool) $input->getOption('force-boost-mode-flush'));