diff --git a/src/authorize.ts b/src/authorize.ts
index 4ebf68e..c677f9f 100644
--- a/src/authorize.ts
+++ b/src/authorize.ts
@@ -30,7 +30,7 @@ interface CompleteDecodedToken {
   payload: any
 }
 
-type SecretCallback = (decodedToken: CompleteDecodedToken) => Promise<string>
+type SecretCallback = (decodedToken: CompleteDecodedToken) => Promise<string> | string
 
 export interface AuthorizeOptions {
   secret: string | SecretCallback