diff --git a/core/Command/TaskProcessing/Cleanup.php b/core/Command/TaskProcessing/Cleanup.php
index 7a1b1bea5a73a..0ae7cbfae3043 100644
--- a/core/Command/TaskProcessing/Cleanup.php
+++ b/core/Command/TaskProcessing/Cleanup.php
@@ -46,7 +46,7 @@ protected function configure() {
 	}
 
 	protected function execute(InputInterface $input, OutputInterface $output): int {
-		$maxAgeSeconds = $input->getArgument('maxAgeSeconds') ?? Manager::MAX_TASK_AGE_SECONDS;
+		$maxAgeSeconds = (int) $input->getArgument('maxAgeSeconds') ?? Manager::MAX_TASK_AGE_SECONDS;
 		$output->writeln('<comment>Cleanup up tasks older than ' . $maxAgeSeconds . ' seconds and the related output files</comment>');
 
 		$taskIdsToCleanup = [];