QLabel setMovie bug

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    QLabel *label = new QLabel();
    label->setFrameStyle(QFrame::Panel | QFrame::Sunken);
    QMovie *movie = new QMovie(":/images/loader@2x.gif");
    movie->start();
    label->setMovie(movie);
    hbox->addWidget(label);
    hbox->addStretch();

    ui->verticalLayout->addLayout(hbox);
}