diff --git a/pkg/innerring/processors/governance/process_update.go b/pkg/innerring/processors/governance/process_update.go
index b180b4bbfe..59a73378f4 100644
--- a/pkg/innerring/processors/governance/process_update.go
+++ b/pkg/innerring/processors/governance/process_update.go
@@ -112,12 +112,7 @@ func (gp *Processor) processAlphabetSync(txHash util.Uint256) {
 	}
 
 	// 4. Update NeoFS contract in the mainnet.
-	epoch := gp.epochState.EpochCounter()
-
-	buf := make([]byte, 8)
-	binary.LittleEndian.PutUint64(buf, epoch)
-
-	id := append([]byte(alphabetUpdateIDPrefix), buf...)
+	id := binary.LittleEndian.AppendUint64([]byte(alphabetUpdateIDPrefix), gp.epochState.EpochCounter())
 
 	prm := neofscontract.AlphabetUpdatePrm{}
 
diff --git a/pkg/local_object_storage/pilorama/boltdb.go b/pkg/local_object_storage/pilorama/boltdb.go
index 70b2602b9f..88c6b37431 100644
--- a/pkg/local_object_storage/pilorama/boltdb.go
+++ b/pkg/local_object_storage/pilorama/boltdb.go
@@ -927,11 +927,8 @@ func internalKey(key []byte, k, v string, parent, node Node) []byte {
 	key = append(key, byte(l), byte(l>>8))
 	key = append(key, v...)
 
-	var raw [8]byte
-	binary.LittleEndian.PutUint64(raw[:], parent)
-	key = append(key, raw[:]...)
+	key = binary.LittleEndian.AppendUint64(key, parent)
+	key = binary.LittleEndian.AppendUint64(key, node)
 
-	binary.LittleEndian.PutUint64(raw[:], node)
-	key = append(key, raw[:]...)
 	return key
 }