diff --git a/ns/nns.go b/ns/nns.go
index 2a2ee09..f867b73 100644
--- a/ns/nns.go
+++ b/ns/nns.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"math/big"
 	"net/url"
 
 	"github.com/nspcc-dev/neo-go/pkg/core/state"
@@ -122,7 +123,7 @@ func (n *NNS) ResolveContainerName(name string) (cid.ID, error) {
 		},
 		{
 			Type:  smartcontract.IntegerType,
-			Value: int64(nns.TXT),
+			Value: big.NewInt(int64(nns.TXT)),
 		},
 	})
 	if err != nil {
diff --git a/ns/nns_test.go b/ns/nns_test.go
index 14d8f09..e777b7c 100644
--- a/ns/nns_test.go
+++ b/ns/nns_test.go
@@ -36,7 +36,7 @@ func (x *testNeoClient) call(contract util.Uint160, method string, prm []smartco
 	require.Len(x.t, prm, 2)
 	require.Equal(x.t, smartcontract.StringType, prm[0].Type)
 	require.Equal(x.t, smartcontract.IntegerType, prm[1].Type)
-	require.EqualValues(x.t, nns.TXT, prm[1].Value)
+	require.EqualValues(x.t, big.NewInt(int64(nns.TXT)), prm[1].Value)
 
 	val, ok := prm[0].Value.(string)
 	require.True(x.t, ok)