MenuSeparator is incorrectly positioned on Windows 7

import QtQuick 2.1
import QtQuick.Controls 1.0

Rectangle {
    width: 360
    height: 360

    Button {
        anchors.centerIn: parent
        text: "Menu"
        onClicked: menu.popup()
    }

    Menu {
        id: menu
        title: "Edit"

        MenuItem {
            text: "Stuff"
        }

        MenuSeparator {
        }

        MenuItem {
            text: "About"
        }
    }
}