diff --git a/internal/exporter/metrics.go b/internal/exporter/metrics.go
index f672de9..ba593f8 100644
--- a/internal/exporter/metrics.go
+++ b/internal/exporter/metrics.go
@@ -193,15 +193,19 @@ func (m *Metrics) collectReqeustDataMetrics(ch chan<- prometheus.Metric, queue *
 		sum += latency
 		count++
 
-		var cumulativeCount uint64
 		for _, bound := range bucketBounds {
 			if latency <= bound {
-				cumulativeCount++
+				buckets[bound]++
 			}
-			buckets[bound] += cumulativeCount
 		}
 	}
 
+	var cumulativeCount uint64
+	for _, bound := range bucketBounds {
+		cumulativeCount += buckets[bound]
+		buckets[bound] = cumulativeCount
+	}
+
 	m.counter += uint(len(data))
 	ch <- prometheus.MustNewConstMetric(
 		m.metricRequestsTotal,