QWidget::setCursor for QCursor created from QPixmap with mask does not work second time

class MyWidget : public QWidget
{
    Q_OBJECT
public:
    MyWidget(QWidget * w=0) : QWidget(w) {
        c1 = new QCursor(
                QPixmap(QLatin1String(":/cursor1.png"),"png",Qt::MonoOnly),
                QPixmap(QLatin1String(":/mask.png"),"png",Qt::MonoOnly),
                0,0);
        c2 = new QCursor(
                QPixmap(QLatin1String(":/cursor2.png"),"png",Qt::MonoOnly),
                QPixmap(QLatin1String(":/mask.png"),"png",Qt::MonoOnly),
                0,0);
        current = c1;
        setCursor(*current);
    }

    void mousePressEvent(QMouseEvent*)
    {
        if(current != c1)
            current = c1;
        else
            current = c2;
        setCursor(*current);
    }

private:
    QCursor* c1;
    QCursor* c2;
    QCursor* current;
};