:AngularJS: ng-selected is not working with a true statement

I have a a select box like this:

    <select class="form-control"
            ng-model="contactName"
            ng-change="testFun(contactName)"
            ng-options="contact.Id as contact.Name + ' ' + contact.Surname for contact in company.items.contacts"
            ng-selected="$scope.contactId === contact.Id">
    </select>

Where $scope.contactId = 14151 and contact.Id = 14151

But the select box is still not selecting the right person and remains to show up blank.

I can't figure out what I am doing wrong here.

EDIT

<select class="form-control" 
        ng-model="contactName"
        ng-change="testFun(contactName)"
        ng-options="contact.Id as contact.Name + ' ' + contact.Surname + ' id:' + contact.Id for contact in company.items.contacts"
        ng-selected="contactId == contact.Id">
 </select>
 <pre>
    contactId: {{contactId}}
 </pre>

Which results in the following, which also confirms that the ID's are the same:

The box is still coming up blank

Use ng-init this will work . You can not use $scope inside html . Removing the $scope would work .

<select class="form-control"
        ng-model="contactName"
        ng-change="testFun(contactName)"
        ng-options="contact.Id as contact.Name + ' ' + contact.Surname for contact in company.items.contacts"
        ng-init="contactName = contactId" >
</select>

ngSelected does not work with ngOptions you must use ng-init instead.