diff --git a/include/net/tcp.h b/include/net/tcp.h
index 0d85223..2bb2bad 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -712,6 +712,8 @@
 #define TCPHDR_ECE 0x40
 #define TCPHDR_CWR 0x80
 
+#define TCPHDR_SYN_ECN	(TCPHDR_SYN | TCPHDR_ECE | TCPHDR_CWR)
+
 /* This is what the send packet queuing engine uses to pass
  * TCP per-packet control information to the transmission code.
  * We also store the host-order sequence numbers in here too.