diff --git a/src/definition/accessors/ILivechatCreator.ts b/src/definition/accessors/ILivechatCreator.ts
index 8524ba251..56a3ec17e 100644
--- a/src/definition/accessors/ILivechatCreator.ts
+++ b/src/definition/accessors/ILivechatCreator.ts
@@ -3,6 +3,9 @@ import type { IUser } from '../users';
 
 export interface IExtraRoomParams {
     source?: ILivechatRoom['source'];
+    customFields?: {
+        [key: string]: unknown;
+    };
 }
 
 export interface ILivechatCreator {