diff --git a/src/options.ts b/src/options.ts
index 7986f2f..84a68c9 100644
--- a/src/options.ts
+++ b/src/options.ts
@@ -42,7 +42,7 @@ export type PluginOptions = {
    * Modify the behavior of the error overlay.
    * @default false
    */
-  overlay?: boolean | OverlayOptions;
+  overlay?: boolean | Partial<OverlayOptions>;
 };
 
 export interface NormalizedPluginOptions extends Required<PluginOptions> {