diff --git a/src/node/plugin.ts b/src/node/plugin.ts
index 439757d26dd2..84e5256f28c4 100644
--- a/src/node/plugin.ts
+++ b/src/node/plugin.ts
@@ -194,7 +194,7 @@ export async function createVitePressPlugin(
 
       server.middlewares.use((req, res, next) => {
         if (req.url) {
-          const page = req.url.replace(/[?#].*$/, '').slice(1)
+          const page = req.url.replace(/[?#].*$/, '').slice(site.base.length)
           req.url = req.url.replace(page, rewrites.inv[page] || page)
         }
         next()