diff --git a/proto/kpi_value_api.proto b/proto/kpi_value_api.proto
index 4bd3dd50ff2810960cedacdca5064b5f02d66544..a97b0ae2b023dfe0a535aa3cb1ba63b00b418371 100644
--- a/proto/kpi_value_api.proto
+++ b/proto/kpi_value_api.proto
@@ -19,19 +19,19 @@ import "context.proto";
 import "kpi_manager.proto";
 
 service KpiValueAPIService {
-	rpc StoreKpiValues  (KpiValueList     ) returns (context.Empty   ) {}
-	rpc SelectKpiValues (KpiValueFilter   ) returns (KpiValueList    ) {}
+  rpc StoreKpiValues  (KpiValueList     ) returns (context.Empty   ) {}
+  rpc SelectKpiValues (KpiValueFilter   ) returns (KpiValueList    ) {}
   rpc GetKpiAlarms    (kpi_manager.KpiId) returns (stream KpiAlarms) {}
 }
 
 message KpiValue {
-	kpi_manager.KpiId kpi_id         = 1;
-	context.Timestamp timestamp      = 2;
-	KpiValueType      kpi_value_type = 3;
+  kpi_manager.KpiId kpi_id         = 1;
+  context.Timestamp timestamp      = 2;
+  KpiValueType      kpi_value_type = 3;
 }
 
 message KpiValueList {
-	repeated KpiValue kpi_value_list = 1;
+  repeated KpiValue kpi_value_list = 1;
 }
 
 message KpiValueType {
@@ -47,9 +47,9 @@ message KpiValueType {
 }
 
 message KpiValueFilter {
-	repeated kpi_manager.KpiId kpi_id          = 1;
-	repeated context.Timestamp start_timestamp = 2;
-	repeated context.Timestamp end_timestamp   = 3;
+  repeated kpi_manager.KpiId kpi_id          = 1;
+  repeated context.Timestamp start_timestamp = 2;
+  repeated context.Timestamp end_timestamp   = 3;
 }
 
 message KpiAlarms {