QFontDatabase::families() returns empty list for Symbol writing system

#include <QApplication>
#include <QFontDatabase>
#include <QDebug>
#include <QStringList>

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	QFontDatabase db;
	qDebug() << db.families(QFontDatabase::Symbol);
	return 0;
}