Select an option using Hound

With PhantonJS I cannot find the element, executing the same find_element I got the error below.

%Hound.NoSuchElementError{
  parent: nil,
  selector: "#operationType option[value='1']",
  strategy: :css
}

Inspecting the #operationType element with PhantonJS I saw that all options had blank values.

<select name="" id="operationType">
  <option value="" selected="">Comprar</option>
  <option value="">Alugar</option>
  <option value="">Imóvel Novo</option>
  <option value="">Comercial</option>
  <option value="">Temporada</option>
</select>