diff --git a/packages/core/types/src/cart/workflows.ts b/packages/core/types/src/cart/workflows.ts
index 7b00783fb9..ba4c480438 100644
--- a/packages/core/types/src/cart/workflows.ts
+++ b/packages/core/types/src/cart/workflows.ts
@@ -104,7 +104,7 @@ export interface CartWorkflowDTO extends CartDTO {
 
 export interface ListShippingOptionsForCartWorkflowInputDTO {
   cart_id: string
-  is_return?: boolean
+  is_return: boolean
   sales_channel_id?: string
   currency_code: string
   shipping_address: {