QGroupBox title does not follow alignment with fusion style

void Dialog::createFormGroupBox()
{
    formGroupBox = new QGroupBox(tr("Form layout"));
    // Added alignment; works with the default style but not with fusion style
    formGroupBox->setAlignment( Qt::AlignHCenter );

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    // added the fusion style:
    QApplication::setStyle(QStyleFactory::create("Fusion"));