Icon not colourised after becoming enabled

import QtQuick 2.7
import QtQuick.Controls 2.0

ApplicationWindow {
    id: window
    visible: true
    width: 200
    height: 200

    Switch {
        id: enabledSwitch
    }

    ToolButton {
        id: selectionToolButton
        objectName: "selectionToolButton"
        checkable: true
        enabled: enabledSwitch.checked
        text: "A"
        icon.source: "qrc:/qt-project.org/imports/QtQuick/Controls.2/images/check.png"
        anchors.centerIn: parent
    }
}