diff --git a/types/jsonwebtoken/index.d.ts b/types/jsonwebtoken/index.d.ts
index 33d4f7b999..9ab87a022a 100644
--- a/types/jsonwebtoken/index.d.ts
+++ b/types/jsonwebtoken/index.d.ts
@@ -4,7 +4,8 @@
 //                 Daniel Heim <https://github.com/danielheim>,
 //                 Brice BERNARD <https://github.com/brikou>,
 //                 Veli-Pekka Kestilä <https://github.com/vpk>,
-//                 Daniel Parker <https://github.com/rlgod>
+//                 Daniel Parker <https://github.com/rlgod>,
+//                 Kjell Dießel <https://github.com/kettil>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.2
 
@@ -17,9 +18,9 @@ export class JsonWebTokenError extends Error {
 }
 
 export class TokenExpiredError extends JsonWebTokenError {
-    expiredAt: number;
+    expiredAt: Date;
 
-    constructor(message: string, expiredAt: number);
+    constructor(message: string, expiredAt: Date);
 }
 
 export class NotBeforeError extends JsonWebTokenError {