diff --git a/net/core/dev.c b/net/core/dev.c
index 8efe850..6b6ef14 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2532,7 +2532,7 @@
 			goto done;
 
 		ip = (const struct iphdr *) (skb->data + nhoff);
-		if (ip->frag_off & htons(IP_MF | IP_OFFSET))
+		if (ip_is_fragment(ip))
 			ip_proto = 0;
 		else
 			ip_proto = ip->protocol;