diff --git a/packages/sdk/src/mini-app/types.ts b/packages/sdk/src/mini-app/types.ts
index ef370e003..820a0ba0d 100644
--- a/packages/sdk/src/mini-app/types.ts
+++ b/packages/sdk/src/mini-app/types.ts
@@ -31,7 +31,7 @@ export interface RequestedContact {
     userId: number;
     phoneNumber: string;
     firstName: string;
-    lastName: string;
+    lastName?: string;
   };
   authDate: Date;
   hash: string;