diff --git a/pkg/core/transaction/attrtype.go b/pkg/core/transaction/attrtype.go
index 7f339245f9..c7a57f14c8 100644
--- a/pkg/core/transaction/attrtype.go
+++ b/pkg/core/transaction/attrtype.go
@@ -15,10 +15,10 @@ const (
 // List of valid attribute types.
 const (
 	HighPriority    AttrType = 1
-	OracleResponseT AttrType = 0x11                   // OracleResponse
-	NotValidBeforeT AttrType = ReservedLowerBound     // NotValidBefore
-	ConflictsT      AttrType = ReservedLowerBound + 1 // Conflicts
-	NotaryAssistedT AttrType = ReservedLowerBound + 2 // NotaryAssisted
+	OracleResponseT AttrType = 0x11 // OracleResponse
+	NotValidBeforeT AttrType = 0x20 // NotValidBefore
+	ConflictsT      AttrType = 0x21 // Conflicts
+	NotaryAssistedT AttrType = 0x22 // NotaryAssisted
 )
 
 func (a AttrType) allowMultiple() bool {
diff --git a/pkg/core/transaction/attrtype_string.go b/pkg/core/transaction/attrtype_string.go
index 1f2eb06bab..d3564aa4c2 100644
--- a/pkg/core/transaction/attrtype_string.go
+++ b/pkg/core/transaction/attrtype_string.go
@@ -10,9 +10,9 @@ func _() {
 	var x [1]struct{}
 	_ = x[HighPriority-1]
 	_ = x[OracleResponseT-17]
-	_ = x[NotValidBeforeT-224]
-	_ = x[ConflictsT-225]
-	_ = x[NotaryAssistedT-226]
+	_ = x[NotValidBeforeT-32]
+	_ = x[ConflictsT-33]
+	_ = x[NotaryAssistedT-34]
 }
 
 const (
@@ -31,8 +31,8 @@ func (i AttrType) String() string {
 		return _AttrType_name_0
 	case i == 17:
 		return _AttrType_name_1
-	case 224 <= i && i <= 226:
-		i -= 224
+	case 32 <= i && i <= 34:
+		i -= 32
 		return _AttrType_name_2[_AttrType_index_2[i]:_AttrType_index_2[i+1]]
 	default:
 		return "AttrType(" + strconv.FormatInt(int64(i), 10) + ")"