diff --git a/index.d.ts b/index.d.ts
index 0234135f..56bb8d1d 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -113,7 +113,7 @@ declare namespace OAuthClient {
 
     export interface AuthorizeParams {
         scope: scopes | scopes[] | string;
-        state?: csrf;
+        state?: csrf | string;
     }
 
     export interface RevokeParams {