diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c
index cc52b98..93a9cee 100644
--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c
@@ -220,6 +220,10 @@
 	    skb->data[1] == PPP_UI)
 		skb_pull(skb, 2);
 
+	/* Decompress protocol field if PFC is enabled */
+	if ((*skb->data) & 0x1)
+		*(u8 *)skb_push(skb, 1) = 0;
+
 	if (sk->sk_state & PPPOX_BOUND) {
 		struct pppox_sock *po;