Rollback on ember-cli not working

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For some reason I can't get ember-cli to perform a rollback. The model data comes in fine and I can see it getting dirty in the Ember Inspector, but rollback doesn't work. I get "undefined is not a function."

I have this in the controller:

actions: {
    revertChanges: function() {
        this.get('model').rollback();
    }
}

Do I need to import something extra? I'm using Ember : 1.10.0, Ember Data : 1.0.0-beta.15