diff --git a/storage/metric/curator_test.go b/storage/metric/curator_test.go
index 2d0750fea..782dcd0e9 100644
--- a/storage/metric/curator_test.go
+++ b/storage/metric/curator_test.go
@@ -40,7 +40,7 @@ type (
 
 	sample struct {
 		time  time.Time
-		value float64
+		value model.SampleValue
 	}
 
 	sampleGroup struct {
@@ -90,7 +90,7 @@ func (s sampleGroup) Get() (key, value coding.Encoder) {
 	for _, value := range s.values {
 		series.Value = append(series.Value, &dto.SampleValueSeries_Value{
 			Timestamp: proto.Int64(value.time.Unix()),
-			Value:     proto.Float64(value.value),
+			Value:     value.value.ToDTO(),
 		})
 	}
 
diff --git a/storage/metric/rule_integration_test.go b/storage/metric/rule_integration_test.go
index c71b6622c..6004a0521 100644
--- a/storage/metric/rule_integration_test.go
+++ b/storage/metric/rule_integration_test.go
@@ -26,7 +26,7 @@ func GetValueAtTimeTests(persistenceMaker func() (MetricPersistence, test.Closer
 		month time.Month
 		day   int
 		hour  int
-		value float64
+		value model.SampleValue
 	}
 
 	type input struct {
@@ -358,7 +358,7 @@ func GetBoundaryValuesTests(persistenceMaker func() (MetricPersistence, test.Clo
 		month time.Month
 		day   int
 		hour  int
-		value float64
+		value model.SampleValue
 	}
 
 	type input struct {
@@ -672,7 +672,7 @@ func GetRangeValuesTests(persistenceMaker func() (MetricPersistence, test.Closer
 		month time.Month
 		day   int
 		hour  int
-		value float64
+		value model.SampleValue
 	}
 
 	type input struct {