False positive for "Remove unused method" when helper method is used from another helper

[hakanai]

I receive a false positive on "Remove unused method" when a helper method is used from another helper method. In this particular case:

module ApplicationHelper
  def named_model_options(model_class, additional = [])
    #omitted
  end
end

module RelationshipsHelper
  def relationship_options(additional = [])
    named_model_options(Relationship, additional)
  end
end

I get the warning on "named_model_options" even though it is called from almost every other helper.