diff --git a/tests/stub.php b/tests/stub.php
index aead6809..83581d11 100644
--- a/tests/stub.php
+++ b/tests/stub.php
@@ -796,6 +796,9 @@ public function getUpdater() {
 
 		public function getWatcher() {
 		}
+
+		public function setOwner(?string $user) : void {
+		}
 	}
 
 	class Jail extends Wrapper {