How to configure SoftDelete Behavior

namespace PhalconRest\Models;
use Phalcon\Mvc\Model\Behavior\SoftDelete;
use Phalcon\Mvc\Collection as Collection;

class ModelBase extends Collection {

public function initialize() {
    $softDelete = new SoftDelete([
                'field' => 'is_deleted',
                'value' => 1
            ]);
    $this->addBehavior($softDelete);
}
}

I am getting below error. Please advice.

 PHP Fatal error:  Uncaught TypeError: Argument 1 passed to Phalcon\\Mvc\\Collection::addBehavior() must implement interface Phalcon\\Mvc\\Collection\\BehaviorInterface, instance of Phalcon\\Mvc\\Model\\Behavior\\SoftDelete