QML Audio refuses to play repeatedly

import QtQuick 2.5
import QtQuick.Window 2.2
import QtQuick.Controls 1.4
import QtMultimedia 5.5

Window {
    visible: true

    Column {
        anchors.centerIn: parent
        Button {
            text: "Play"
            onClicked:
                audio.play()
        }
        Button {
            text: "Stop"
            onClicked:
                audio.stop()
        }
    }
    Audio {
        id: audio
        source: "success.ogg"
        onError: {
            console.log("error: " + error)
        }
        onStatusChanged:
            console.log("status: " + status)
    }
}