diff --git a/src/Model/User.php b/src/Model/User.php
index 41e612ac80..7204fd0ac8 100644
--- a/src/Model/User.php
+++ b/src/Model/User.php
@@ -1353,7 +1353,7 @@ class User
 	 */
 	public static function remove(int $uid)
 	{
-		if (!$uid) {
+		if (empty($uid)) {
 			return false;
 		}
 
diff --git a/src/Worker/Notifier.php b/src/Worker/Notifier.php
index 36081455ca..4044e3769a 100644
--- a/src/Worker/Notifier.php
+++ b/src/Worker/Notifier.php
@@ -53,7 +53,7 @@ use Friendica\Protocol\Salmon;
 
 class Notifier
 {
-	public static function execute($cmd, $target_id)
+	public static function execute(string $cmd, int $target_id)
 	{
 		$a = DI::app();