diff --git a/file/lib/data/chat/room/ChatRoomAction.class.php b/file/lib/data/chat/room/ChatRoomAction.class.php
index 18b0f94..6549e20 100644
--- a/file/lib/data/chat/room/ChatRoomAction.class.php
+++ b/file/lib/data/chat/room/ChatRoomAction.class.php
@@ -86,11 +86,11 @@ public function validateUpdatePosition() {
 			WCF::getSession()->checkPermissions($this->permissionsUpdate);
 		}
 		else {
-			throw new PermissionDeniedException();
+			throw new \wcf\system\exception\PermissionDeniedException();
 		}
 		
 		if (!isset($this->parameters['data']['structure'])) {
-			throw new UserInputException('structure');
+			throw new \wcf\system\exception\UserInputException('structure');
 		}
 		
 		if (!isset($this->parameters['data']['offset'])) $this->parameters['data']['offset'] = 0;