Moc: Signals from parent class need to be redefined

#include <QCoreApplication>

class MyClass : public QObject
{
    Q_OBJECT
    Q_PROPERTY(bool value READ getValue WRITE setValue NOTIFY valueChanged)
public:
    MyClass() : m_value(true) {}
    bool getValue() const { return m_value; }
    void setValue(bool newValue) { m_value = newValue; }
Q_SIGNALS:
    void valueChanged();
private:
    bool m_value;
};

class MyClassReadOnly : public MyClass
{
    Q_OBJECT
    Q_PROPERTY(bool value READ getValue NOTIFY valueChanged)
Q_SIGNALS:
    //void valueChanged();
};

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    MyClassReadOnly w;
    return 0;
}
#include "main.moc"