diff --git a/proto/spaceone/api/alert_manager/v1/service.proto b/proto/spaceone/api/alert_manager/v1/service.proto
index 85ee1a69..88b72ea7 100644
--- a/proto/spaceone/api/alert_manager/v1/service.proto
+++ b/proto/spaceone/api/alert_manager/v1/service.proto
@@ -76,8 +76,8 @@ message ServiceOptions {
 }
 
 message AlertStats {
-    int32 high = 1;
-    int32 low = 2;
+    int32 HIGH = 1;
+    int32 LOW = 2;
 }
 
 message Alerts {