diff --git a/packages/@vuepress/plugin-last-updated/index.js b/packages/@vuepress/plugin-last-updated/index.js
index 72e48094d5..e8a59a15a9 100644
--- a/packages/@vuepress/plugin-last-updated/index.js
+++ b/packages/@vuepress/plugin-last-updated/index.js
@@ -11,6 +11,7 @@ module.exports = (options = {}, context) => ({
         ? transformer(timestamp, $lang)
         : defaultTransformer(timestamp, $lang, dateOptions)
       $page.lastUpdated = lastUpdated
+      $page.lastUpdatedTimestamp = timestamp
     }
   }
 })