The "select all" header checkbox that I used in Django 1.5 is missing in Django 1.9

Very straightforward question. There used to be a checkbox in the header of the Django admin site, but after upgrading from Django 1.5 to 1.9 it is no longer there.

Also, I can no longer shift-select rows.

I cannot for the life of me find any configuration options around this. Hoping it is something obvious.