diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 1edf96a..9febfb6 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -387,6 +387,7 @@
 	u8	repair_queue;
 	u8	do_early_retrans:1,/* Enable RFC5827 early-retransmit  */
 		early_retrans_delayed:1, /* Delayed ER timer installed */
+		syn_data:1,	/* SYN includes data */
 		syn_fastopen:1;	/* SYN includes Fast Open option */
 
 /* RTT measurement */