How to search by country using django-countries?

I have a Model containing a CountryField (using https://pypi.python.org/pypi/django-countries):

class Person(models.Model):      name = models.CharField(max_length=100)      country = CountryField(          countries_flag_url='//flags.example.com/{code}.png')

I want to be able to search in admin interface by country. But it doesn't work. What can I do?

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