diff --git a/kv/kv_interface.go b/kv/kv_interface.go
index ee62c91fa..c79c2e187 100644
--- a/kv/kv_interface.go
+++ b/kv/kv_interface.go
@@ -61,6 +61,9 @@ import (
 
 const ReadersLimit = 32000 // MDBX_READERS_LIMIT=32767
 
+// const Unbounded []byte = nil
+const Unlim int = -1
+
 var (
 	ErrAttemptToDeleteNonDeprecatedBucket = errors.New("only buckets from dbutils.ChaindataDeprecatedTables can be deleted")
 
diff --git a/kv/mdbx/kv_mdbx_test.go b/kv/mdbx/kv_mdbx_test.go
index 8c96fdabe..6fac3a222 100644
--- a/kv/mdbx/kv_mdbx_test.go
+++ b/kv/mdbx/kv_mdbx_test.go
@@ -126,7 +126,7 @@ func TestRange(t *testing.T) {
 		_, tx, _ := BaseCase(t)
 
 		//[from, to)
-		it, err := tx.RangeDescend("Table", []byte("key3"), []byte("key1"), -1)
+		it, err := tx.RangeDescend("Table", []byte("key3"), []byte("key1"), kv.Unlim)
 		require.NoError(t, err)
 		require.True(t, it.HasNext())
 		k, v, err := it.Next()