Unix/Linux: QFileSystemWatcher with Inotify doesn't detect modified files

#include <QtGui>

class Object : public QObject
{
    Q_OBJECT
public:
    Object() : QObject()
    {
        QFileSystemWatcher *watcher = new QFileSystemWatcher(this);
        watcher->addPath(QDir::current().absolutePath());
        connect(watcher, SIGNAL(directoryChanged(const QString &)), this,
                SLOT(onDirModified(const QString &)));
    }

public slots:
    void onDirModified(const QString &path)
    {
        qDebug() << path;
    }
};

#include "main.moc"

int main(int argc, char **argv)
{
    QCoreApplication a(argc, argv);
    Object o;
    return a.exec();
}