diff --git a/drivers/net/wan/lapbether.c b/drivers/net/wan/lapbether.c
index f357a7ac70ac4756967730fa61c07258b4b3ac00..5c91160dd68cc1dfa4308d38fb111032206fae75 100644
--- a/drivers/net/wan/lapbether.c
+++ b/drivers/net/wan/lapbether.c
@@ -473,6 +473,9 @@ static int lapbeth_device_event(struct notifier_block *this,
                if (lapbeth)
                        lapbeth_free_device(lapbeth);
                break;
+       case NETDEV_PRE_TYPE_CHANGE:
+               /* Our underlying device type must not change. */
+               return NOTIFY_BAD;
        }
 
        return NOTIFY_DONE;