diff --git a/types/rest/client.d.ts b/types/rest/client.d.ts
index a49d75a..ced5bb3 100644
--- a/types/rest/client.d.ts
+++ b/types/rest/client.d.ts
@@ -7,7 +7,7 @@ export function validateSignature(uri: string, nonce: string, signature: string,
  * You can also pass in additional parameters accepted by the node requests module.
  */
 export class Client {
-    constructor(authId: string, authToken: string, options?: string);
+    constructor(authId?: string, authToken?: string, options?: string);
     calls: CallInterface;
     accounts: AccountInterface;
     subaccounts: SubaccountInterface;