diff --git a/src/types.ts b/src/types.ts
index f8fddc4..77d722e 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -1,2 +1,2 @@
 export type Profile = any;
-export type CallbackResult = [Profile, string | null];
+export type CallbackResult = [Profile, string | null, { error: string } | null];