diff --git a/lib/IO/v1/schemas.ts b/lib/IO/v1/schemas.ts
index b7db6aa..4041b23 100644
--- a/lib/IO/v1/schemas.ts
+++ b/lib/IO/v1/schemas.ts
@@ -126,7 +126,7 @@ export type AuthLoginWithChallengeRequestItem = z.infer<
 >
 export const AuthLoginWithChallengeRequestItem = object({
   discriminator: literal('loginWithChallenge'),
-  string: string(),
+  challenge: string(),
 })
 
 export const AuthLoginRequestItem = union([