diff --git a/internal/exporter/metrics.go b/internal/exporter/metrics.go
index 8f6d036..f672de9 100644
--- a/internal/exporter/metrics.go
+++ b/internal/exporter/metrics.go
@@ -193,10 +193,12 @@ func (m *Metrics) collectReqeustDataMetrics(ch chan<- prometheus.Metric, queue *
 		sum += latency
 		count++
 
+		var cumulativeCount uint64
 		for _, bound := range bucketBounds {
 			if latency <= bound {
-				buckets[bound]++
+				cumulativeCount++
 			}
+			buckets[bound] += cumulativeCount
 		}
 	}