diff --git a/core/Command/SetupChecks.php b/core/Command/SetupChecks.php
index 114028f50ed7e..aeea900aa6f52 100644
--- a/core/Command/SetupChecks.php
+++ b/core/Command/SetupChecks.php
@@ -36,7 +36,7 @@ public function __construct(
 		parent::__construct();
 	}
 
-	protected function configure() {
+	protected function configure(): void {
 		parent::configure();
 
 		$this