Nokogiri builder escapes new lines

I'm trying to build a simple XML document like this:

builder = Nokogiri::XML::Builder.new
builder.document do |xml|
    xml.title title
    xml.content do
        xml.cdata body_string
    end
    xml.pubDate item.xpath('./pubDate/text()').first.content.chomp
end

All of the new lines that go into content are escaped as \n. Is there a way I can force Nokogiri to leave the new lines intact?