Django - Form - Fields : Modify the "for" attribute in

I have been stuck on this problem for hours and my research did not help. I'll make it quick:

I am building a form page and create it field-by field using

{{ myForm.myField }}

More precisely, 'myField' is a MultipleChoiceField. I am trying to tweak it so I can use it with a CSS template. Here its definition :

class myForm(models.ModelForm):
    myField = forms.ChoiceField(choices=MY_CHOICES, 
                          widget=RadioSelect(attrs={'data-toggle': 'radio',
                                                    'id': 'radio'}),
                          label='')

The goal here is to have a "for" attribute in "label" being "radio".

It is almost the case ! Here is the HTML result:

<div class="form-group">
<label for="radio_0">
  <input class="" data-toggle="radio" (...) type="radio" value="1" />
</label>
<label for="radio_1">
  <input class="" data-toggle="radio" (...) type="radio" value="2" />
</label>
<label for="radio_2">
  <input class="" data-toggle="radio" (...) type="radio" value="3" />
</label>
</div>

As you can see, the "for" attribute is becoming "radio_0", "radio_1" and so forth but not simply "radio" which bothers me...

Would you know a way to solve this?

Thank you for your consideration.