diff --git a/lib/middleware/conditional-get.js b/lib/middleware/conditional-get.js
index 7a71b49..537fe7d 100644
--- a/lib/middleware/conditional-get.js
+++ b/lib/middleware/conditional-get.js
@@ -14,7 +14,7 @@ module.exports = function (options) {
     }
   }
 
-  return async (next) => {
+  return async function (next) {
     yield* etag.call(this, next);
     if (this.request.fresh) this.response.status = 304;
   }
diff --git a/lib/middleware/headers.js b/lib/middleware/headers.js
index a0fc247..1bba6de 100644
--- a/lib/middleware/headers.js
+++ b/lib/middleware/headers.js
@@ -34,7 +34,7 @@ module.exports = function (app, options) {
   // enable by default
   if (nosniff != null) nosniff = true;
 
-  app.use(async (ctx, next) => {
+  app.use(async function (ctx, next) {
     ctx.response.set('X-Powered-By', 'koala, koa');
     if (hsts) ctx.response.set('Strict-Transport-Security', hsts);
     if (nosniff) ctx.response.set('X-Content-Type-Options', 'nosniff');
diff --git a/lib/middleware/pageNotFoundHandler.js b/lib/middleware/pageNotFoundHandler.js
index 02b24be..6665481 100644
--- a/lib/middleware/pageNotFoundHandler.js
+++ b/lib/middleware/pageNotFoundHandler.js
@@ -1,4 +1,4 @@
-module.exports = async(ctx, next) => {
+module.exports = async function (ctx, next) {
   try {
     await next()
     const status = ctx.status || 404
@@ -12,10 +12,10 @@ module.exports = async(ctx, next) => {
     ctx.status = err.status || 500
     if (ctx.status === 404) {
       //Your 404.jade
-      await ctx.render(`${__dirname}/404`)
+      await ctx.render(`${__dirname}/../templates/404`)
     } else {
       //other_error jade
-      await ctx.render('error', ctx)
+      await ctx.render(`${__dirname}/../templates/error`, ctx)
     }
   }
 }
diff --git a/lib/middleware/trace.js b/lib/middleware/trace.js
index 2380e87..e9c7f37 100644
--- a/lib/middleware/trace.js
+++ b/lib/middleware/trace.js
@@ -1,7 +1,7 @@
 
 var randomBytes = require('mz/crypto').randomBytes;
 
-module.exports = async (ctx, next) => {
+module.exports = async function (ctx, next) {
   this.id = await randomBytes(24);
 
   var req = ctx.req;
diff --git a/test/app/basic-auth.js b/test/app/basic-auth.js
index aef55c6..ebbfff5 100644
--- a/test/app/basic-auth.js
+++ b/test/app/basic-auth.js
@@ -2,7 +2,7 @@
 describe('Basic Auth', function () {
   it('should return the value', function (done) {
     var app = new Koala()
-    app.use(async (next) => {
+    app.use(async function (next) {
       this.body = this.request.basicAuth
     })