Semantic-ui preset checkbox state

I've got a simple semantic-ui checkbox as follows:

<div id="del-checkbox-div" class="ui checkbox">
   <input type="hidden" value="0" name="delete_show_data" onclick=check()>
   <input id="delete-data-checkbox" type="checkbox" value="1" name="delete_show_data" onclick=check()>
   <label for="delete-data-checkbox">Delete show data</label>
</div>

I'd like to preset its state on page load. Per the semantic-ui documentation I should be able to do the following in javascript:

jQuery('#del-checkbox-div').checkbox('behavior', 'uncheck');

However, I'm getting the following error:

TypeError: jQuery(...).checkbox is not a function

Can someone clue me in as to what I might be doing wrong?