GtkMessageDialog no icon issue

void
err_msg_box ()
{
	GtkWidget *msg_box;

	msg_box = gtk_message_dialog_new (NULL, GTK_DIALOG_MODAL,
					  GTK_MESSAGE_WARNING, GTK_BUTTONS_CLOSE,
					  "JACK server not started.");

	gtk_window_set_title (GTK_WINDOW (msg_box), "Warning");
	gtk_dialog_run (GTK_DIALOG (msg_box));
	gtk_widget_destroy (msg_box);
}