diff --git a/include/linux/sctp.h b/include/linux/sctp.h
index b464b9d..c20d3ce 100644
--- a/include/linux/sctp.h
+++ b/include/linux/sctp.h
@@ -242,6 +242,7 @@
 	SCTP_DATA_FIRST_FRAG	= 0x02,
 	SCTP_DATA_NOT_FRAG	= 0x03,
 	SCTP_DATA_UNORDERED	= 0x04,
+	SCTP_DATA_SACK_IMM	= 0x08,
 };
 enum { SCTP_DATA_FRAG_MASK = 0x03, };