diff --git a/pkg/core/native/native_neo.go b/pkg/core/native/native_neo.go
index e1d5d3f50..75b2a7a95 100644
--- a/pkg/core/native/native_neo.go
+++ b/pkg/core/native/native_neo.go
@@ -726,6 +726,28 @@ func (n *NEO) VoteInternal(ic *interop.Context, h util.Uint160, pub *keys.Public
 	if err != nil {
 		return err
 	}
+	// we should put it in storage anyway as it affects dumps
+	err = ic.DAO.PutStorageItem(n.ID, key, si)
+	if err != nil {
+		return err
+	}
+	if pub != nil {
+		valKey := makeValidatorKey(pub)
+		valSi := ic.DAO.GetStorageItem(n.ID, valKey)
+		if valSi == nil {
+			return errors.New("unknown validator")
+		}
+		cd := new(candidate).FromBytes(valSi)
+		// we should put it in storage anyway as it affects dumps
+		err = ic.DAO.PutStorageItem(n.ID, valKey, valSi)
+		if err != nil {
+			return err
+		}
+		if !cd.Registered {
+			return errors.New("validator must be registered")
+		}
+	}
+
 	if (acc.VoteTo == nil) != (pub == nil) {
 		val := &acc.Balance
 		if pub == nil {
@@ -765,8 +787,6 @@ func (n *NEO) ModifyAccountVotes(acc *state.NEOBalanceState, d dao.DAO, value *b
 			if ok {
 				return err
 			}
-		} else if !cd.Registered {
-			return errors.New("validator must be registered")
 		}
 		n.validators.Store(keys.PublicKeys(nil))
 		return d.PutStorageItem(n.ID, key, cd.Bytes())
diff --git a/scripts/compare-dumps.go b/scripts/compare-dumps.go
index d18897d29..73458c3c0 100644
--- a/scripts/compare-dumps.go
+++ b/scripts/compare-dumps.go
@@ -15,7 +15,7 @@ import (
 	"github.com/urfave/cli"
 )
 
-var ledgerContractID = -2
+var ledgerContractID = -4
 
 type dump []blockDump
 
diff --git a/scripts/compare-dumps_test.go b/scripts/compare-dumps_test.go
new file mode 100644
index 000000000..85a50fc64
--- /dev/null
+++ b/scripts/compare-dumps_test.go
@@ -0,0 +1,13 @@
+package main
+
+import (
+	"testing"
+
+	"github.com/nspcc-dev/neo-go/pkg/core/native"
+	"github.com/stretchr/testify/require"
+)
+
+func TestCompatibility(t *testing.T) {
+	cs := native.NewContracts(false, map[string][]uint32{})
+	require.Equal(t, cs.Ledger.ID, int32(ledgerContractID))
+}