Setting automaticOrientation to false does not take any effect

When the automaticOrientation is set to false, my app still rotates when my app rotates. It does not take any effect.

MainView {
    // objectName for functional testing purposes (autopilot-qt5)
    objectName: "mainView"

    // Note! applicationName needs to match the "name" field of the click manifest
    applicationName: "com.ubuntu.developer.liu-xiao-guo.Memory"

    /*
     This property enables the application to change orientation
     when the device is rotated. The default is false.
    */
    automaticOrientation: false

    width: units.gu(60)
    height: units.gu(85)

    Page {
        title: i18n.tr("Memory Card")

        Game {
            anchors.fill: parent
            anchors.horizontalCenter: parent.horizontalCenter
            anchors.verticalCenter: parent.verticalCenter
        }
    }
}