diff --git a/index.d.ts b/index.d.ts
index 60a6f69..c063e4f 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -1,4 +1,4 @@
 import { Secret } from 'jsonwebtoken'
 
-function generate(authKey: Secret, keyId: string, teamId: string, ttl?: number, origin?: string): void;
+function generate(authKey: Secret, keyId: string, teamId: string, ttl?: number, origin?: string): string;
 export = generate;
\ No newline at end of file