diff --git a/pkg/local_object_storage/shard/metrics_test.go b/pkg/local_object_storage/shard/metrics_test.go
index 60adc072..91e158b0 100644
--- a/pkg/local_object_storage/shard/metrics_test.go
+++ b/pkg/local_object_storage/shard/metrics_test.go
@@ -28,13 +28,17 @@ type metricsStore struct {
 	errCounter  int64
 }
 
-func (m metricsStore) SetShardID(_ string) {}
+func (m *metricsStore) SetShardID(_ string) {}
 
-func (m metricsStore) SetObjectCounter(objectType string, v uint64) {
+func (m *metricsStore) SetObjectCounter(objectType string, v uint64) {
+	m.mtx.Lock()
+	defer m.mtx.Unlock()
 	m.objCounters[objectType] = v
 }
 
-func (m metricsStore) AddToObjectCounter(objectType string, delta int) {
+func (m *metricsStore) AddToObjectCounter(objectType string, delta int) {
+	m.mtx.Lock()
+	defer m.mtx.Unlock()
 	switch {
 	case delta > 0:
 		m.objCounters[objectType] += uint64(delta)