diff --git a/middlewares/index.js b/middlewares/index.js
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/middlewares/permission.js b/middlewares/isAdmin.js
similarity index 88%
rename from middlewares/permission.js
rename to middlewares/isAdmin.js
index 36f1d4b52d2..fefa5acbba8 100644
--- a/middlewares/permission.js
+++ b/middlewares/isAdmin.js
@@ -1,6 +1,4 @@
-const pm = {};
-
-pm.isAdmin = async (ctx, next) => {
+module.exports = async (ctx, next) => {
     ctx.state.chat = await ctx.getChat();
     const chat = ctx.state.chat;
     if (chat.type !== 'private') {
@@ -19,4 +17,3 @@ pm.isAdmin = async (ctx, next) => {
     await next();
 };
 
-module.exports = pm;