--- zzzz-none-000/linux-4.4.60/include/uapi/linux/if_pppox.h	2017-04-08 07:53:53.000000000 +0000
+++ jet-2400-727/linux-4.4.60/include/uapi/linux/if_pppox.h	2021-03-17 14:36:41.000000000 +0000
@@ -47,6 +47,7 @@
  */
 struct pptp_addr {
 	__u16		call_id;
+	__u16		pad;
 	struct in_addr	sin_addr;
 };