ember-cli (2.4.3) not generating DS models

I am very surprised not to get DS models upon generating ember-cli model

ember -v
ember-cli: 2.4.3
node: 5.10.1
os: darwin x64

ember g model rental

Then I get :

// app/models/rentals
import Model from 'ember-data/model';
export default Model.extend({
});

according to the ember guide , I should get :

// app/models/rentals
import DS from 'ember-data';
export default DS.Model.extend({
});

what could be wrong ? thanks for feedback