Regression: Alt-key accelerators in QDialogButtonBox not working

#include <QApplication>
#include <QDialog>
#include <QDialogButtonBox>

int main(int argc, char** argv)
{
 QApplication app(argc, argv);
 QDialog* dlg = new QDialog;
 dlg->setMinimumWidth(200);
 QDialogButtonBox* box = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Reset, Qt::Horizontal,   dlg);
 QDialogButtonBox::connect(box, &QDialogButtonBox::accepted, dlg, &QDialog::accept);
 dlg->show();
 return app.exec();
}