diff --git a/proto/spaceone/api/cost_analysis/v1/cost_report_config.proto b/proto/spaceone/api/cost_analysis/v1/cost_report_config.proto
index cc36cadf..ca6db78e 100644
--- a/proto/spaceone/api/cost_analysis/v1/cost_report_config.proto
+++ b/proto/spaceone/api/cost_analysis/v1/cost_report_config.proto
@@ -149,7 +149,7 @@ message UpdateCostReportConfigRecipientsRequest {
 message CostReportConfigRequest {
   // The ID of cost report in the Protocol.
   string cost_report_config_id = 1;
-  optional bool send_report = 2;
+  bool send_report = 2;
 }
 
 message CostReportConfigQuery {