diff --git a/frontend/viewer/vite.config.ts b/frontend/viewer/vite.config.ts
index 591375b77..94a797f8a 100644
--- a/frontend/viewer/vite.config.ts
+++ b/frontend/viewer/vite.config.ts
@@ -23,7 +23,7 @@ export default defineConfig(({ mode, command }) => {
       sourcemap: true,
       chunkSizeWarningLimit: 1000,
       rollupOptions: {
-        input: ['src/main.ts', 'src/app.postcss'],
+        input: webComponent ? undefined : ['src/main.ts'],
         output: {
           entryFileNames: '[name].js',
           chunkFileNames: '[name].js',