diff --git a/types/dialog.d.ts b/types/dialog.d.ts
index 9bd1aaadd..9193b29f4 100644
--- a/types/dialog.d.ts
+++ b/types/dialog.d.ts
@@ -5,6 +5,7 @@ export type DialogOptions = {
   title?: string;
   message?: string;
   overlay?: boolean;
+  className?: string;
   lockScroll?: boolean;
   confirmButtonText?: string;
   cancelButtonText?: string;