diff --git a/sysdeps/gnu/netinet/udp.h b/sysdeps/gnu/netinet/udp.h
index 32159cd..8cc1c60 100644
--- a/sysdeps/gnu/netinet/udp.h
+++ b/sysdeps/gnu/netinet/udp.h
@@ -78,6 +78,10 @@ struct udphdr
 #define UDP_CORK	1	/* Never send partially complete segments.  */
 #define UDP_ENCAP	100	/* Set the socket to accept
 				   encapsulated packets.  */
+#define UDP_NO_CHECK6_TX 101	/* Disable sending checksum for UDP
+				   over IPv6.  */
+#define UDP_NO_CHECK6_RX 102	/* Disable accepting checksum for UDP
+				   over IPv6.  */
 
 /* UDP encapsulation types */
 #define UDP_ENCAP_ESPINUDP_NON_IKE 1	/* draft-ietf-ipsec-nat-t-ike-00/01 */