diff --git a/src/websocket.ts b/src/websocket.ts
index f118dbb..049c60c 100644
--- a/src/websocket.ts
+++ b/src/websocket.ts
@@ -679,5 +679,5 @@ export function wsJsonToRes<ResponseType>(
   msg: any,
   responseClass: ClassConstructor<ResponseType>
 ): ResponseType {
-  return deserialize(responseClass, msg.data);
+  return deserialize(responseClass, JSON.stringify(msg.data));
 }