Uic/Designer generates wrong code for Q_PROPERTY

If a Custom Widget with a Q_Property of type Qt::PenStyle like:
Q_PROPERTY( Qt::PenStyle borderStyle MEMBER m_borderStyle) is used with Qt Designer, the generated header contains the following line:
label->setProperty("style", QVariant(Qt::SolidLine));

This results in compile time error like:
error: C2248: 'QVariant::QVariant' : cannot access private member declared in class 'QVariant'