diff --git a/pkg/metrics/morphcache.go b/pkg/metrics/morphcache.go
index 2440adcf..000ec0d8 100644
--- a/pkg/metrics/morphcache.go
+++ b/pkg/metrics/morphcache.go
@@ -6,7 +6,6 @@ import (
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-observability/metrics"
-	"github.com/nspcc-dev/neo-go/pkg/util"
 	"github.com/prometheus/client_golang/prometheus"
 )
 
@@ -20,7 +19,7 @@ type MorphCacheMetrics interface {
 
 	AddGroupKeyDuration(success bool, d time.Duration)
 
-	AddTxHeightDuration(hash util.Uint256, success bool, d time.Duration)
+	AddTxHeightDuration(success bool, d time.Duration)
 }
 
 type morphCacheMetrics struct {
@@ -60,7 +59,7 @@ func (m *morphCacheMetrics) AddGroupKeyDuration(success bool, d time.Duration) {
 	).Observe(float64(d))
 }
 
-func (m *morphCacheMetrics) AddTxHeightDuration(hash util.Uint256, success bool, d time.Duration) {
+func (m *morphCacheMetrics) AddTxHeightDuration(success bool, d time.Duration) {
 	m.txHeightDuration.With(
 		prometheus.Labels{
 			mcSuccess: strconv.FormatBool(success),
diff --git a/pkg/morph/client/notary.go b/pkg/morph/client/notary.go
index 680ba6a6..e567b6df 100644
--- a/pkg/morph/client/notary.go
+++ b/pkg/morph/client/notary.go
@@ -800,7 +800,7 @@ func (c *Client) getTransactionHeight(h util.Uint256) (uint32, error) {
 	success := false
 	startedAt := time.Now()
 	defer func() {
-		c.cache.metrics.AddTxHeightDuration(h, success, time.Since(startedAt))
+		c.cache.metrics.AddTxHeightDuration(success, time.Since(startedAt))
 	}()
 
 	if rh, ok := c.cache.txHeights.Get(h); ok {