diff --git a/paddle_billing_client/models/discount.py b/paddle_billing_client/models/discount.py
index 3596458b..a7634623 100644
--- a/paddle_billing_client/models/discount.py
+++ b/paddle_billing_client/models/discount.py
@@ -29,7 +29,7 @@ class DiscountBase(BaseModel):
 
 class Discount(DiscountBase):
     id: str
-    times_used: int
+    times_used: int | None = None
     created_at: datetime | None = None
     updated_at: datetime | None = None
     external_id: str | None = None