Problem with Player.setSprinting()

When I move I am sprinting that is right, but if I jump (in air), it stops sprinting and speed is same as not sprinting, when I touch the ground all is again right.

Code:

@EventHandler
    public void onPlayerMoveEvent(PlayerMoveEvent e) {
        if (sprinting) {
            e.getPlayer().setSprinting(true);
        }
    }

(boolean) sprinting - by command you can enable or disable (default: true)

I am beginner, so I will be grateful for reply.
Sorry for my bad english.