Script to check checkbox with li click not working

I have a script which is supposed to check a checkbox if the li is clicked, however this does not happen.

<ul>
<li><input type="checkbox">Tyrannosaurus</li>
<li><input type="checkbox">Tyrannosaurus</li>
<li><input type="checkbox">Tyrannosaurus</li>
<li><input type="checkbox">Tyrannosaurus</li>
<li><input type="checkbox">Tyrannosaurus</li>
<li><input type="checkbox">Tyrannosaurus</li>
</ul>

<script>
$("li").click(function (e) {
        var cb = $(this).find(":checkbox")[0];
        if (e.target != cb) cb.checked = !cb.checked;
        $(this).toggleClass("selected", cb.checked);
    });
</script>