diff --git a/src/def.d.ts b/src/def.d.ts
index f0bfbab..035febe 100644
--- a/src/def.d.ts
+++ b/src/def.d.ts
@@ -83,6 +83,7 @@ interface ConfirmationAlertOptions {
     secondaryConfirmText?: string;
     onConfirmSecondary?: () => void;
     cancelText?: string;
+    onCancel?: () => void;
     isDismissable?: boolean;
 }