diff --git a/tests/container_test.go b/tests/container_test.go
index 9fe8431..70c6bdc 100644
--- a/tests/container_test.go
+++ b/tests/container_test.go
@@ -58,8 +58,12 @@ func newContainerInvoker(t *testing.T) (*neotest.ContractInvoker, *neotest.Contr
 }
 
 func setContainerOwner(c []byte, acc neotest.Signer) {
+	copy(c[6:], signerToOwner(acc))
+}
+
+func signerToOwner(acc neotest.Signer) []byte {
 	owner, _ := base58.Decode(address.Uint160ToString(acc.ScriptHash()))
-	copy(c[6:], owner)
+	return owner
 }
 
 type testContainer struct {
@@ -268,7 +272,7 @@ func TestContainerOwner(t *testing.T) {
 		c.InvokeFail(t, container.NotFoundError, "owner", id[:])
 	})
 
-	owner, _ := base58.Decode(address.Uint160ToString(acc.ScriptHash()))
+	owner := signerToOwner(acc)
 	c.Invoke(t, stackitem.NewBuffer(owner), "owner", cnt.id[:])
 }
 
diff --git a/tests/frostfsid_test.go b/tests/frostfsid_test.go
index 4089b9b..2e25e58 100644
--- a/tests/frostfsid_test.go
+++ b/tests/frostfsid_test.go
@@ -7,9 +7,7 @@ import (
 	"testing"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-contract/container"
-	"github.com/mr-tron/base58"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
-	"github.com/nspcc-dev/neo-go/pkg/encoding/address"
 	"github.com/nspcc-dev/neo-go/pkg/neotest"
 	"github.com/nspcc-dev/neo-go/pkg/util"
 	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
@@ -57,7 +55,7 @@ func TestFrostFSID_AddKey(t *testing.T) {
 		pubs[i] = p.PublicKey().Bytes()
 	}
 	acc := e.NewAccount(t)
-	owner, _ := base58.Decode(address.Uint160ToString(acc.ScriptHash()))
+	owner := signerToOwner(acc)
 	e.Invoke(t, stackitem.Null{}, "addKey", owner,
 		[]interface{}{pubs[0], pubs[1]})