diff --git a/History.md b/History.md
index 30f3d76988..a14ddff207 100644
--- a/History.md
+++ b/History.md
@@ -2,6 +2,7 @@
 ===
 
   * deps: Remove setprototypeof
+  * no longer need to call the restore method to restore `req.params` after invoking router
 
 5.x
 ===
diff --git a/lib/application.js b/lib/application.js
index fd4dcf19fc..148e1fd53b 100644
--- a/lib/application.js
+++ b/lib/application.js
@@ -197,22 +197,7 @@ class ExpressApp extends EventEmitter {
   #mergeMethodsFromTargetToSource(source, target) {
     Object.keys(source).forEach(key => target[key] = source[key].bind(target))
   }
-  #mergeRequestAndResponse (req, res, fn) {
-    if (req.originalUrl === req.baseUrl) {
-      this.#mergeMethodsFromTargetToSource(fn.request, req)
-      this.#mergeMethodsFromTargetToSource(fn.response, res)
-    } else {
-      this.#mergeMethodsFromTargetToSource(this.request, req)
-      this.#mergeMethodsFromTargetToSource(this.response, res)
-    }
-  }
-  #wrapper (fn) {
-    return (req, res, next) => {
-      this.#mergeMethodsFromTargetToSource(this.request, req)
-      this.#mergeMethodsFromTargetToSource(this.response, res)
-      fn(req, res, next)
-    }
-  }
+
   /**
    * Proxy `Router#use()` to add middleware to the app router.
    * See Router#use() documentation for details.
diff --git a/lib/router.js b/lib/router.js
index 2065d05681..2b929f6f67 100644
--- a/lib/router.js
+++ b/lib/router.js
@@ -162,7 +162,7 @@ Router.prototype.handle = function handle (req, res, callback) {
   // manage inter-router variables
   var parentParams = req.params
   var parentUrl = req.baseUrl || ''
-  var done = restore(callback, req, 'baseUrl', 'next', 'params')
+  var done = callback
 
   // setup next layer
   req.next = next
@@ -635,31 +635,6 @@ function processParams (params, layer, called, req, res, done) {
   param()
 }
 
-/**
- * Restore obj props after function
- *
- * @private
- */
-
-function restore (fn, obj) {
-  var props = new Array(arguments.length - 2)
-  var vals = new Array(arguments.length - 2)
-
-  for (var i = 0; i < props.length; i++) {
-    props[i] = arguments[i + 2]
-    vals[i] = obj[props[i]]
-  }
-
-  return function () {
-    // restore vals
-    for (var i = 0; i < props.length; i++) {
-      obj[props[i]] = vals[i]
-    }
-
-    return fn.apply(this, arguments)
-  }
-}
-
 /**
  * Send an OPTIONS response.
  *
diff --git a/test/AppRouter.mjs b/test/AppRouter.mjs
index dc86d76191..d7bb12c1b2 100644
--- a/test/AppRouter.mjs
+++ b/test/AppRouter.mjs
@@ -13,6 +13,7 @@ describe('app.router', () => {
   it('should restore req.params after leaving router', (t, done) => {
     const app = express()
     const router = new express.Router()
+    const server = app.listen()
 
     function handler1(req, res, next){
       res.setHeader('x-user-id', String(req.params.id))
@@ -30,11 +31,11 @@ describe('app.router', () => {
 
     app.get('/user/:id', handler1, router, handler2)
 
-    request(app)
+    request(server)
     .get('/user/1')
     .expect('x-router', 'undefined')
     .expect('x-user-id', '1')
-    .expect(200, '1', done)
+    .expect(200, '1', () => server.close(done))
   })
 
   describe('methods', () => {
@@ -382,6 +383,7 @@ describe('app.router', () => {
 
     it('should restore req.params', (t, done) => {
       const app = express()
+      const server = app.listen()
       const router = new express.Router({ mergeParams: true })
 
       router.get('/user-(\\w+)/(.*)', (req, res, next) => {
@@ -395,9 +397,9 @@ describe('app.router', () => {
         })
       })
 
-      request(app)
+      request(server)
       .get('/user/id-42/user-tj/profile')
-      .expect(200, '[["0","42"]]', done)
+      .expect(200, '[["0","42"]]', () => server.close(done))
     })
   })