diff --git a/packages/@vuepress/core/lib/app/redirect.js b/packages/@vuepress/core/lib/app/redirect.js
index 4c99d5b6f9..3f59573961 100644
--- a/packages/@vuepress/core/lib/app/redirect.js
+++ b/packages/@vuepress/core/lib/app/redirect.js
@@ -50,5 +50,5 @@ export function handleRedirectForCleanUrls (router) {
 }
 
 function isRouteExists (router, path) {
-  return router.options.routes.filter(route => route.path === path).length > 0
+  return router.options.routes.filter(route => route.path.toLowerCase() === path.toLowerCase()).length > 0
 }