diff --git a/pumps/prometheus.go b/pumps/prometheus.go
index 764919d75..f277e6985 100644
--- a/pumps/prometheus.go
+++ b/pumps/prometheus.go
@@ -334,7 +334,7 @@ func (pm *PrometheusMetric) InitVec() error {
 			prometheus.HistogramOpts{
 				Name:    pm.Name,
 				Help:    pm.Help,
-				Buckets: buckets,
+				Buckets: bkts,
 			},
 			pm.Labels,
 		)