diff --git a/packages/histoire-app/vite.config.ts b/packages/histoire-app/vite.config.ts
index 6de10402..34e2e16a 100644
--- a/packages/histoire-app/vite.config.ts
+++ b/packages/histoire-app/vite.config.ts
@@ -51,6 +51,9 @@ export default defineConfig({
     lib: {
       entry: '',
       formats: ['es'],
+      // eslint-disable-next-line ts/prefer-ts-expect-error
+      // @ts-ignore only exists in Vite 6
+      cssFileName: 'style',
     },
     rollupOptions: {
       external: [
diff --git a/packages/histoire-controls/vite.config.ts b/packages/histoire-controls/vite.config.ts
index b4a599ad..7497811f 100644
--- a/packages/histoire-controls/vite.config.ts
+++ b/packages/histoire-controls/vite.config.ts
@@ -30,6 +30,9 @@ export default defineConfig({
         'es',
       ],
       fileName: 'index.es',
+      // eslint-disable-next-line ts/prefer-ts-expect-error
+      // @ts-ignore only exists in Vite 6
+      cssFileName: 'style',
     },
 
     rollupOptions: {