diff --git a/ServerMessage.ts b/ServerMessage.ts
index 69510a3..23d15a9 100644
--- a/ServerMessage.ts
+++ b/ServerMessage.ts
@@ -45,14 +45,14 @@ export function isServerMessage(
 
 export type TextMessage = ServerMessage & {
   type: MessageType.TEXT;
-  author: number;
+  author: string;
   content: string;
 };
 export function isTextMessage(obj: unknown): obj is TextMessage {
   if (!isServerMessage(obj, MessageType.TEXT)) return false;
   if (
     !Object.hasOwnProperty.call(obj, "author") ||
-    typeof (obj as ServerMessage & { author: unknown }).author !== "number"
+    typeof (obj as ServerMessage & { author: unknown }).author !== "string"
   ) {
     return false;
   }