diff --git a/file/lib/action/ChatLeaveAction.class.php b/file/lib/action/ChatLeaveAction.class.php
index 6a372a0..f2f3146 100644
--- a/file/lib/action/ChatLeaveAction.class.php
+++ b/file/lib/action/ChatLeaveAction.class.php
@@ -59,6 +59,7 @@ public function execute() {
 		\wcf\util\ChatUtil::writeUserData(array('roomID' => null));
 		
 		$this->executed();
+		header("HTTP/1.0 204 No Content");
 		exit;
 	}
 }