diff --git a/services/pay/complaint_upload.go b/services/pay/complaint_upload.go
index 9a6e568..dda426e 100644
--- a/services/pay/complaint_upload.go
+++ b/services/pay/complaint_upload.go
@@ -9,7 +9,7 @@ type ComplaintUploadRequest struct {
 	*requests.RpcRequest
 	MchId       string `position:"Body" field:"mch_id" default:"" `
 	ImageUrl    string `position:"Body" field:"image_url" default:"" `
-	ComplaintId string `position:"Body" field:"complaint_id" default:"" `
+	ComplaintId string `position:"Body" field:"complaint_id" default:" " `
 }
 
 type ComplaintUploadResponse struct {