diff --git a/theme/src/node/theme.ts b/theme/src/node/theme.ts
index 8a4197bf..02bb1fd6 100644
--- a/theme/src/node/theme.ts
+++ b/theme/src/node/theme.ts
@@ -63,12 +63,13 @@ export function plumeTheme(options: ThemeOptions = {}): Theme {
 
       plugins: setupPlugins(app, plugins),
 
-      extendsBundlerOptions: async (bundlerOptions, app) => {
-        extendsBundlerOptions(bundlerOptions, app)
+      extendsMarkdownOptions: async (_, app) => {
         await configLoader.waiting()
         await generateFileListFrontmatter(app)
       },
 
+      extendsBundlerOptions,
+
       templateBuildRenderer,
 
       extendsPage: page => extendsPageData(page as Page<ThemePageData>),