Default Browser Checkboxes Showing Up in Addition to Angular-Material md-checkboxes

I am using Angular material elements in my Angular app, and in one section where I'm using md-checkboxes I'm noticing that with Chrome, both the UI for the md-checkboxes as well as what looks like the default browser checkboxes are showing up. How do I disable the default browser UI checkboxes from showing up?

<md-checkbox class="request-option" [checked]="hasBeenRequest()"
             (change)="onOptionSelected($event, 'ct')">Consulting
</md-checkbox>