diff --git a/lib/pkg.ts b/lib/pkg.ts
index 554e6eb8ad..f8511ee0d9 100644
--- a/lib/pkg.ts
+++ b/lib/pkg.ts
@@ -5,7 +5,7 @@ import type { Data } from './types';
 
 let app: Hono;
 
-export const init = async (conf: ConfigEnv) => {
+export const init = async (conf?: ConfigEnv) => {
     setConfig(
         Object.assign(
             {