diff --git a/lib/application.js b/lib/application.js
index b8b69c0670..c82126f4bb 100644
--- a/lib/application.js
+++ b/lib/application.js
@@ -83,12 +83,6 @@ app.defaultConfiguration = function(){
   if (env === 'production') {
     this.enable('view cache');
   }
-
-  Object.defineProperty(this, 'router', {
-    get: function() {
-      throw new Error('\'app.router\' is deprecated!\nPlease see the 3.x to 4.x migration guide for details on how to update your app.');
-    }
-  });
 };
 
 /**
diff --git a/test/app.js b/test/app.js
index 117f4dffeb..0e09040df4 100644
--- a/test/app.js
+++ b/test/app.js
@@ -55,18 +55,6 @@ describe('app.mountpath', function(){
   })
 })
 
-describe('app.router', function(){
-  it('should throw with notice', function(done){
-    var app = express()
-
-    try {
-      app.router;
-    } catch(err) {
-      done();
-    }
-  })
-})
-
 describe('app.path()', function(){
   it('should return the canonical', function(){
     var app = express()