diff --git a/src/definition/livechat/ILivechatRoom.ts b/src/definition/livechat/ILivechatRoom.ts
index 8cfe7059b..e3f551423 100644
--- a/src/definition/livechat/ILivechatRoom.ts
+++ b/src/definition/livechat/ILivechatRoom.ts
@@ -37,6 +37,8 @@ export interface ILivechatRoom extends IRoom {
     visitor: IVisitor;
     visitorChannelInfo?: IVisitorChannelInfo;
     department?: IDepartment;
+    closer: 'user' | 'visitor' | 'bot';
+    closedBy?: IUser;
     servedBy?: IUser;
     responseBy?: IUser;
     isWaitingResponse: boolean;