diff --git a/frostfsid/frostfsid_contract.go b/frostfsid/frostfsid_contract.go
index 2b48d95..1167041 100644
--- a/frostfsid/frostfsid_contract.go
+++ b/frostfsid/frostfsid_contract.go
@@ -107,6 +107,8 @@ const (
 	nsPurgeState  = "purge"
 )
 
+var dummyValue = []byte{1}
+
 func _deploy(data any, isUpdate bool) {
 	ctx := storage.GetContext()
 
@@ -168,7 +170,7 @@ func _deploy(data any, isUpdate bool) {
 				subject := std.Deserialize(iterator.Value(it).([]byte)).(Subject)
 				subjAddr := contract.CreateStandardAccount(subject.PrimaryKey)
 				for i := 0; i < len(subject.AdditionalKeys); i++ {
-					storage.Put(ctx, subjectToAdditionalKeyKey(subjAddr, subject.AdditionalKeys[i]), []byte{1})
+					storage.Put(ctx, subjectToAdditionalKeyKey(subjAddr, subject.AdditionalKeys[i]), dummyValue)
 				}
 				subject.AdditionalKeys = nil
 				storage.Put(ctx, subjectKeyFromAddr(subjAddr), std.Serialize(subject))
@@ -268,7 +270,7 @@ func CreateSubject(ns string, key interop.PublicKey) {
 	storage.Put(ctx, sKey, std.Serialize(subj))
 
 	nsSubjKey := namespaceSubjectKey(ns, addr)
-	storage.Put(ctx, nsSubjKey, []byte{1})
+	storage.Put(ctx, nsSubjKey, dummyValue)
 	storage.Put(ctx, allAddressKey, true)
 
 	runtime.Notify("CreateSubject", interop.Hash160(addr))
@@ -297,7 +299,7 @@ func AddSubjectKey(addr interop.Hash160, key interop.PublicKey) {
 		panic("key already added")
 	}
 
-	storage.Put(ctx, saKey, []byte{1})
+	storage.Put(ctx, saKey, dummyValue)
 
 	sKey := subjectKeyFromAddr(addr)
 	data = storage.Get(ctx, sKey).([]byte)
@@ -307,7 +309,7 @@ func AddSubjectKey(addr interop.Hash160, key interop.PublicKey) {
 	subject := std.Deserialize(data).(Subject)
 	checkNamespaceState(subject.Namespace)
 
-	storage.Put(ctx, subjectToAdditionalKeyKey(addr, key), []byte{1})
+	storage.Put(ctx, subjectToAdditionalKeyKey(addr, key), dummyValue)
 	storage.Put(ctx, addressKey, true)
 	runtime.Notify("AddSubjectKey", addr, key)
 }
@@ -938,7 +940,7 @@ func AddSubjectToGroup(addr interop.Hash160, groupID int) {
 	}
 
 	gsKey := groupSubjectKey(subject.Namespace, groupID, addr)
-	storage.Put(ctx, gsKey, []byte{1})
+	storage.Put(ctx, gsKey, dummyValue)
 
 	runtime.Notify("AddSubjectToGroup", addr, subject.Namespace, groupID)
 }