diff --git a/en/guide/using-middleware.md b/en/guide/using-middleware.md
index 3fb27bc9f0..c575277db1 100644
--- a/en/guide/using-middleware.md
+++ b/en/guide/using-middleware.md
@@ -104,7 +104,7 @@ This example shows a middleware sub-stack that handles GET requests to the `/use
 ```js
 app.get('/user/:id', function (req, res, next) {
   // if the user ID is 0, skip to the next route
-  if (req.params.id === 0) next('route')
+  if (req.params.id === '0') next('route')
   // otherwise pass the control to the next middleware function in this stack
   else next()
 }, function (req, res, next) {
@@ -151,7 +151,7 @@ router.use('/user/:id', function (req, res, next) {
 // a middleware sub-stack that handles GET requests to the /user/:id path
 router.get('/user/:id', function (req, res, next) {
   // if the user ID is 0, skip to the next router
-  if (req.params.id === 0) next('route')
+  if (req.params.id === '0') next('route')
   // otherwise pass control to the next middleware function in this stack
   else next()
 }, function (req, res, next) {