diff --git a/src/node/plugins/localSearchPlugin.ts b/src/node/plugins/localSearchPlugin.ts
index 35991cff..96b0bbed 100644
--- a/src/node/plugins/localSearchPlugin.ts
+++ b/src/node/plugins/localSearchPlugin.ts
@@ -97,7 +97,7 @@ export async function localSearchPlugin(
   function getDocId(file: string) {
     let relFile = path.relative(siteConfig.srcDir, file)
     relFile = siteConfig.rewrites.map[relFile] || relFile
-    let id = path.join(siteConfig.userConfig.base ?? '/', relFile)
+    let id = path.join(siteConfig.site.base, relFile)
     id = id.replace(/\.md$/, siteConfig.cleanUrls ? '' : '.html')
     return id
   }