diff --git a/src/api/catalog/IPurchasableOffer.ts b/src/api/catalog/IPurchasableOffer.ts
index bea7781..e918c50 100644
--- a/src/api/catalog/IPurchasableOffer.ts
+++ b/src/api/catalog/IPurchasableOffer.ts
@@ -24,4 +24,5 @@ export interface IPurchasableOffer
     products: IProduct[];
     itemIds: string;
     haveOffer: boolean;
+    clone?(): IPurchasableOffer;
 }