diff --git a/include/net/tcp.h b/include/net/tcp.h
index d6bcf13..97af77c 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -454,6 +454,7 @@
 extern void tcp_xmit_retransmit_queue(struct sock *);
 extern void tcp_simple_retransmit(struct sock *);
 extern int tcp_trim_head(struct sock *, struct sk_buff *, u32);
+extern int tcp_fragment(struct sock *, struct sk_buff *, u32, unsigned int);
 
 extern void tcp_send_probe0(struct sock *);
 extern void tcp_send_partial(struct sock *);