diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 9308af0..6589adb 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -340,6 +340,12 @@
 	udph->dest = htons(np->remote_port);
 	udph->len = htons(udp_len);
 	udph->check = 0;
+	udph->check = csum_tcpudp_magic(htonl(np->local_ip),
+					htonl(np->remote_ip),
+					udp_len, IPPROTO_UDP,
+					csum_partial((unsigned char *)udph, udp_len, 0));
+	if (udph->check == 0)
+		udph->check = -1;
 
 	skb->nh.iph = iph = (struct iphdr *)skb_push(skb, sizeof(*iph));