diff --git a/lib/build/index.js b/lib/build/index.js
index 80cb7c37d0..20e7bf14a8 100644
--- a/lib/build/index.js
+++ b/lib/build/index.js
@@ -232,10 +232,10 @@ function cleanChildrenRoutes (routes, isChild = false) {
   let isOptional = true
   routes.forEach((route) => {
     route.path = (isChild) ? route.path.replace('/', '') : route.path
-    if (route.path === '') {
+    if (route.path === '' || route.path === '/') {
       isOptional = false
     }
-    if (isChild && isOptional && route.path.includes(':')) {
+    if (isOptional && route.path.includes(':')) {
       route.path += '?'
     }
     if (route.children) {