diff --git a/model/sanmai.go b/model/sanmai.go
index 16c0a86..01a201b 100644
--- a/model/sanmai.go
+++ b/model/sanmai.go
@@ -351,7 +351,7 @@ type SubmitConfirmPriceResp struct {
 }
 
 type CancelOrderEvaluationReq struct {
-	OrderId int `json:"orderId"`
+	OrderId int `json:"order_id"`
 }
 
 type CancelOrderEvaluationResp struct {