diff --git a/packages/@vuepress/plugin-blog/index.js b/packages/@vuepress/plugin-blog/index.js
index 00a4d870f2..4ed4a4ca9a 100644
--- a/packages/@vuepress/plugin-blog/index.js
+++ b/packages/@vuepress/plugin-blog/index.js
@@ -64,7 +64,7 @@ module.exports = (options, ctx) => {
         frontmatter = {}
       }) => {
         if (when(pageCtx)) {
-          Object.assign(rawFrontmatter, frontmatter)
+          Object.assign(frontmatter, rawFrontmatter)
           Object.assign(pageCtx, data)
         }
       })