Django - pdf response has wrong encoding - xhtml2pdf

I'm working on an invoice PDF generator on my Django website. I use xhtml2pdf. It seems to be working but encodings is not correct. There are wrong signs/characters when I use diacritics.

This is a view:

def render_to_pdf(template_src, context_dict):
    template = get_template("pdf/pdf.html")
    context = context_dict
    html  = template.render(context)
    result = StringIO.StringIO()

    pdf = pisa.pisaDocument(StringIO.StringIO(html.encode('utf-8'), result)
    if not pdf.err:
        return HttpResponse(result.getvalue(), content_type='application/pdf; encoding="utf-8"')
    return HttpResponse('We had some errors<pre>%s</pre>' % escape(html))

And this is the html:

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>title</title>
  </head>
  <body>
    <p>Č š ž Ž x y ľ ĺ ó</p>
  </body>
</html>

This is the generated pdf:

Do you know how to make it work correctly?

<!DOCTYPE html> <html> <head> <style> @font-face { font-family: FreeSans; src: url("/usr/share/fonts/truetype/freefont/FreeSans.ttf"); } body { font-family: FreeSans; } </style> <meta charset="UTF-8"> <title>title</title> </head> <body> <p>Č š ž Ž x y ľ ĺ ó</p> </body> </html>

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