diff --git a/extensions/compat_skbuff.h b/extensions/compat_skbuff.h
index d201992..97aa971 100644
--- a/extensions/compat_skbuff.h
+++ b/extensions/compat_skbuff.h
@@ -10,6 +10,7 @@
 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 21)
 #	define ip_hdr(skb) ((skb)->nh.iph)
 #	define ip_hdrlen(skb) (ip_hdr(skb)->ihl * 4)
+#	define ipv6_hdr(skb) ((skb)->nh.ipv6h)
 #	define skb_network_header(skb) ((skb)->nh.raw)
 static inline void skb_reset_network_header(struct sk_buff *skb)
 {