diff --git a/.travis.yml b/.travis.yml
index eb8f422..413e146 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,8 @@
 sudo: false
 language: node_js
 node_js:
+  - '5'
+  - '4'
   - '3'
   - '2'
   - '1'
diff --git a/index.js b/index.js
index 2f6fb4e..9c0a8c7 100644
--- a/index.js
+++ b/index.js
@@ -80,6 +80,7 @@ function KoaRoles(options) {
   this.functionList = [];
   this.failureHandler = options.failureHandler || defaultFailureHandler;
   this.userProperty = options.userProperty || 'user';
+  this.actionMap = {};
 }
 
 /**
@@ -118,10 +119,23 @@ KoaRoles.prototype.use2 = function (action, fn) {
     throw new TypeError('action can\'t start with `/`');
   }
   assertFunction(fn);
+
+  var old = this.actionMap[action];
+  // create or override
+  this.actionMap[action] = fn;
+
+  // action fn have already been used, skip
+  if (old) {
+    return;
+  }
+
+  var roles = this;
   this.use1(function *(act) {
+    // get fn from actionMap
+    var fn = roles.actionMap[action];
     if (act === action) {
       if (is.generatorFunction(fn)) {
-        return yield *fn.call(this);
+        return yield* fn.call(this);
       } else {
         return fn.call(this);
       }
@@ -136,11 +150,11 @@ KoaRoles.prototype.use2 = function (action, fn) {
 KoaRoles.prototype.can = function (action) {
   var roles = this;
   return function *(next) {
-    if (yield *roles.test(this, action)) {
-      return yield *next;
+    if (yield* roles.test(this, action)) {
+      return yield* next;
     }
     if (is.generatorFunction(roles.failureHandler)) {
-      yield *roles.failureHandler.call(this, action);
+      yield* roles.failureHandler.call(this, action);
     } else {
       roles.failureHandler.call(this, action);
     }
@@ -163,7 +177,7 @@ KoaRoles.prototype.test = function *(ctx, action) {
     var fn = this.functionList[i];
     var vote = null;
     if (is.generatorFunction(fn)) {
-      vote = yield *fn.call(ctx, action);
+      vote = yield* fn.call(ctx, action);
     } else {
       vote = fn.call(ctx, action);
     }
@@ -191,13 +205,13 @@ KoaRoles.prototype.middleware = function (options) {
       }
     }
     this.userIs = this.userCan = roleCheck;
-    yield *next;
+    yield* next;
   };
 };
 
 function tester(roles, ctx) {
   return function *(action) {
-    return yield *roles.test(ctx, action);
+    return yield* roles.test(ctx, action);
   };
 }
 
diff --git a/test/koa-roles.test.js b/test/koa-roles.test.js
index 7b2e911..d6855f9 100644
--- a/test/koa-roles.test.js
+++ b/test/koa-roles.test.js
@@ -43,6 +43,15 @@ describe('koa-roles.test.js', function () {
     return this.query.role === 'user';
   });
 
+  roles.use('friend', function () {
+    return this.query.role === 'shaoshuai0102';
+  });
+
+  // override previous friend
+  roles.use('friend', function () {
+    return this.query.role === 'bar';
+  });
+
   // default
   roles.use(function (action) {
     if (this.query.role === action) {
@@ -90,6 +99,10 @@ describe('koa-roles.test.js', function () {
     this.body = 'page can visit by user or admin, current is ' + this.query.role;
   });
 
+  app.get('/friend', roles.can('friend'), function *() {
+    this.body = 'The best friend of foo is ' + this.query.role;
+  });
+
   app.get('/any', function *(next) {
     var isadmin = yield *this.userCan('admin');
     if (!isadmin) {
@@ -235,4 +248,18 @@ describe('koa-roles.test.js', function () {
     .post('/profile/1/123?role=other')
     .expect(404, done);
   });
+
+  it('should get /friend 200 for bar', function(done) {
+    request(app)
+    .get('/friend?role=bar')
+    .expect('The best friend of foo is bar')
+    .expect(200, done);
+  });
+
+  it('should get /friend 403 for shaoshuai0102 because of role override', function(done) {
+    request(app)
+    .get('/friend?role=shaoshuai0102')
+    .expect({"message":"Access Denied - You don\'t have permission to: friend"})
+    .expect(403, done);
+  });
 });