diff --git a/cdc/owner/metrics.go b/cdc/owner/metrics.go
index 97b7c43a46b..6ea7a084c75 100644
--- a/cdc/owner/metrics.go
+++ b/cdc/owner/metrics.go
@@ -159,6 +159,6 @@ func InitMetrics(registry *prometheus.Registry) {
 func lagBucket() []float64 {
 	buckets := prometheus.LinearBuckets(0.5, 0.5, 20)
 	buckets = append(buckets, prometheus.LinearBuckets(11, 1, 10)...)
-	buckets = append(buckets, prometheus.ExponentialBuckets(40, 2, 10)...)
+	buckets = append(buckets, prometheus.ExponentialBuckets(21, 2, 10)...)
 	return buckets
 }
diff --git a/cdc/owner/metrics_test.go b/cdc/owner/metrics_test.go
index b927d3f7497..f45c669bbe7 100644
--- a/cdc/owner/metrics_test.go
+++ b/cdc/owner/metrics_test.go
@@ -23,5 +23,7 @@ func TestLagBucket(t *testing.T) {
 	buckets := lagBucket()
 	require.Equal(t, 40, len(buckets))
 	require.Equal(t, 0.5, buckets[0])
-	require.Equal(t, float64(20480), buckets[39])
+	require.Equal(t, 1.0, buckets[1])
+	require.Equal(t, 21.0, buckets[30])
+	require.Equal(t, float64(10752), buckets[39])
 }