diff --git a/types/feathersjs__authentication-jwt/index.d.ts b/types/feathersjs__authentication-jwt/index.d.ts
index d78a23c643..16d79bb885 100644
--- a/types/feathersjs__authentication-jwt/index.d.ts
+++ b/types/feathersjs__authentication-jwt/index.d.ts
@@ -52,7 +52,7 @@ export class Verifier {
     verify(req: Request, payload: any, done: (error: any, user?: any, info?: any) => void): void;
 }
 
-export type JwtFromRequestFunction = (req: Request) => string;
+export type JwtFromRequestFunction = (req: Request) => string | null;
 
 export const ExtractJwt: {
     fromHeader(header_name: string): JwtFromRequestFunction;