diff --git a/storage/metrics.go b/storage/metrics.go
index dc7f4e01c..a38f9ac72 100644
--- a/storage/metrics.go
+++ b/storage/metrics.go
@@ -94,6 +94,7 @@ func init() {
 	prometheus.MustRegister(rangeCounter)
 	prometheus.MustRegister(putCounter)
 	prometheus.MustRegister(deleteCounter)
+	prometheus.MustRegister(txnCounter)
 	prometheus.MustRegister(keysGauge)
 	prometheus.MustRegister(indexCompactionPauseDurations)
 	prometheus.MustRegister(dbCompactionPauseDurations)