Can't figure out how to get x-select to have proper pre-selected value

I have the following time zone select field:

  x-select value=location.timezone class="form-control"
    each timeZones as |timeZone|
      x-option value=timeZone.name
        ' (GMT) 

The problem with the select field is that it doesn't pre-select the value of location.timezone. This isn't surprising. Each timeZone is an object, not a string, but timezone is a string.

How can I make this x-select match timeZone.name with location.timezone?