diff --git a/types/modal.d.ts b/types/modal.d.ts
index b49ccd77b..a5bc6e151 100644
--- a/types/modal.d.ts
+++ b/types/modal.d.ts
@@ -128,7 +128,7 @@ export interface ModalOptions {
    */
   onOk?: () => any;
 
-  parentContext: Object;
+  parentContext?: object;
 }
 
 export interface ModalConfirm {