diff --git a/include/netinet/udp.h b/include/netinet/udp.h
index b1b0eb819af5d2843103311b00eee2b137ca6600..030e8fb2c47a0c204a734644e1b82eace61da652 100644
--- a/include/netinet/udp.h
+++ b/include/netinet/udp.h
@@ -28,6 +28,8 @@ struct udphdr {
 #define UDP_ENCAP_ESPINUDP_NON_IKE 1
 #define UDP_ENCAP_ESPINUDP	2
 #define UDP_ENCAP_L2TPINUDP	3
+#define UDP_ENCAP_GTP0		4
+#define UDP_ENCAP_GTP1U		5
 
 #define SOL_UDP            17