diff --git a/ChangeLog b/ChangeLog
index e026e56669..1a9b7ca2f3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2018-02-06  Joseph Myers  <joseph@codesourcery.com>
 
+	* sysdeps/gnu/netinet/tcp.h (TCP_FASTOPEN_KEY): New macro.
+	(TCP_FASTOPEN_NO_COOKIE): Likewise.
+
 	* sysdeps/unix/sysv/linux/bits/in.h (IPV6_FREEBIND): New macro.
 
 	[BZ #14890]
diff --git a/sysdeps/gnu/netinet/tcp.h b/sysdeps/gnu/netinet/tcp.h
index 75973f0955..44a72e929e 100644
--- a/sysdeps/gnu/netinet/tcp.h
+++ b/sysdeps/gnu/netinet/tcp.h
@@ -73,6 +73,8 @@
 #define TCP_FASTOPEN_CONNECT	 30 /* Attempt FastOpen with connect.  */
 #define TCP_ULP			 31 /* Attach a ULP to a TCP connection.  */
 #define TCP_MD5SIG_EXT		 32 /* TCP MD5 Signature with extensions.  */
+#define TCP_FASTOPEN_KEY	 33 /* Set the key for Fast Open (cookie).  */
+#define TCP_FASTOPEN_NO_COOKIE	 34 /* Enable TFO without a TFO cookie.  */
 
 #ifdef __USE_MISC
 # include <sys/types.h>