diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 3724790..1c19b2d 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1654,5 +1654,12 @@
 	return skb_shinfo(skb)->gso_size;
 }
 
+static inline void skb_forward_csum(struct sk_buff *skb)
+{
+	/* Unfortunately we don't support this one.  Any brave souls? */
+	if (skb->ip_summed == CHECKSUM_COMPLETE)
+		skb->ip_summed = CHECKSUM_NONE;
+}
+
 #endif	/* __KERNEL__ */
 #endif	/* _LINUX_SKBUFF_H */