ngModel not updating

This code
`<input ng-model="record.preferredTime" ui-time-mask class="form-control w-25 block" placeholder="HH:MM">`

is not updating my ng-model, record.preferredTime is not set.

If i remove the directive ng-model starts again. Whats wrong?
`<input ng-model="record.preferredTime" class="form-control w-25 block" placeholder="HH:MM">`

AngularJs 1.6.4 here.
