Uncheck a checkbox in dat.gui

When I change the option of a dropdown menu, I want all the checkboxes to be unchecked. Here's the code that I put inside a function that's called when the dropdown menu changes:

var inputs = document.getElementsByTagName("input");
for(var i = 0; i < inputs.length; i++) {
        if(inputs[i].type == "checkbox") {
        inputs[i].checked = false; 
    }  
}

This does indeed uncheck the checkbox. However, to recheck the checkbox, it takes two clicks. It appears that dat.gui still thinks the checkbox is checked, so it takes one click to uncheck it, and one more to check it.

How do I make dat.gui update the checkboxes?