diff --git a/index.ts b/index.ts
index 88fa69e..e531feb 100644
--- a/index.ts
+++ b/index.ts
@@ -31,7 +31,7 @@ export interface Settings {
   /** List of words to ignore */
   ignore?: string[];
 }
-const retextCasePolice: Plugin<[Settings], Root> =
+const retextCasePolice: Plugin<[Settings] | [], Root> =
   (settings = {}) =>
   (tree, file) => {
     const ignore = settings.ignore ?? [];