diff --git a/lib/types/aux-user-types.js b/lib/types/aux-user-types.js
index b502fb53a..cccaa8e0f 100644
--- a/lib/types/aux-user-types.js
+++ b/lib/types/aux-user-types.js
@@ -1,15 +1,15 @@
 // @flow
 
 import type { FarcasterUser } from './identity-service-types';
 
-export type AuxUserInfo = { +fid: string };
+export type AuxUserInfo = { +fid: ?string };
 
 export type AuxUserInfos = { +[userID: string]: AuxUserInfo };
 
 export type AuxUserStore = {
   +auxUserInfos: AuxUserInfos,
 };
 
 export type SetFarcasterFriendsFIDPayload = {
   +farcasterUsers: $ReadOnlyArray<FarcasterUser>,
 };