Changing cursor in JavaFX application for long operations

I would like to change the cursor to Cursor.WAIT when executing potentially long operations in JavaFX application. I thought that Platform.runLater will help me:

this.getStage().getScene().setCursor(Cursor.WAIT);

Platform.runLater(new Runnable() {
    @Override
    public void run() {
        // Do some stuff
        getStage().getScene().setCursor(Cursor.DEFAULT);
    }
});

But cursor does not change. Why doesn't this work?