Keyboard modifiers do not work in wheelEvent

class Wid : public QWidget
{
Q_OBJECT
public:
    Wid() {}
protected:
    void wheelEvent(QWheelEvent *ev)
    {
        qDebug() << QApplication::keyboardModifiers().testFlag(Qt::ControlModifier);
        QWidget::wheelEvent(ev);
    }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    qDebug() << qVersion();
    Wid w;
    w.show();

    return a.exec();
}