diff --git a/rest/handler/prometheushandler.go b/rest/handler/prometheushandler.go
index 742ec18c3137..629cb5494e63 100644
--- a/rest/handler/prometheushandler.go
+++ b/rest/handler/prometheushandler.go
@@ -13,7 +13,7 @@ import (
 const serverNamespace = "http_server"
 
 var (
-	rpcServerReqDurBuckets = []float64{5, 10, 25, 50, 100, 250, 500, 750, 1000}
+	serverReqDurBuckets    = []float64{5, 10, 25, 50, 100, 250, 500, 750, 1000}
 	metricServerReqDurOnce sync.Once
 
 	metricServerReqDur metric.HistogramVec
@@ -30,7 +30,7 @@ var (
 // SetServerReqDurBuckets sets buckets for rest server requests duration.
 // It must be called before PrometheusHandler is used.
 func SetServerReqDurBuckets(buckets []float64) {
-	rpcServerReqDurBuckets = buckets
+	serverReqDurBuckets = buckets
 }
 
 // PrometheusHandler returns a middleware that reports stats to prometheus.
@@ -60,7 +60,7 @@ func initMetricServerReqDur() {
 			Name:      "duration_ms",
 			Help:      "http server requests duration(ms).",
 			Labels:    []string{"path", "method", "code"},
-			Buckets:   rpcServerReqDurBuckets,
+			Buckets:   serverReqDurBuckets,
 		})
 	})
 }
diff --git a/rest/handler/prometheushandler_test.go b/rest/handler/prometheushandler_test.go
index df5cd376c39a..29bf5f32182b 100644
--- a/rest/handler/prometheushandler_test.go
+++ b/rest/handler/prometheushandler_test.go
@@ -39,5 +39,5 @@ func TestPromMetricHandler_Enabled(t *testing.T) {
 
 func TestSetRpcServerReqDurBuckets(t *testing.T) {
 	SetServerReqDurBuckets([]float64{0.1})
-	assert.Equal(t, []float64{0.1}, rpcServerReqDurBuckets)
+	assert.Equal(t, []float64{0.1}, serverReqDurBuckets)
 }