diff --git a/lib/common/utils.js b/lib/common/utils.js
index 7e534cf62a..71aba7a4a7 100644
--- a/lib/common/utils.js
+++ b/lib/common/utils.js
@@ -150,8 +150,12 @@ export function flatRoutes(router, path = '', routes = []) {
     if (!r.path.includes(':') && !r.path.includes('*')) {
       /* istanbul ignore if */
       if (r.children) {
+        if (path === '' && r.path === '/') {
+          routes.push('/')
+        }
         flatRoutes(r.children, path + r.path + '/', routes)
       } else {
+        path = path.replace(/^\/+$/, '/')
         routes.push((r.path === '' && path[path.length - 1] === '/' ? path.slice(0, -1) : path) + r.path)
       }
     }