Screen sharing in wayland (XDG_CURRENT_DESKTOP)

/etc/xdg/xfce4/xinitrc contains a line setting XDG_CURRENT_DESKTOP=XFCE. But in order for screen sharing to work with wayland i have to set the value to XDG_CURRENT_DESKTOP=XFCE:labwc:wlroots before running startxfce4 --wayland.