diff --git a/types/index.d.ts b/types/index.d.ts
index 77130198..f6878d25 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -46,4 +46,4 @@ export type PostCSSPluginConf = {
 	exclude?: Parameters<CreateFilter>[1];
 };
 
-export default function (options: Readonly<PostCSSPluginConf>): Plugin
+export default function (options?: Readonly<PostCSSPluginConf>): Plugin