diff --git a/include/netinet/if_ether.h b/include/netinet/if_ether.h
index 4c2322b..05462c4 100644
--- a/include/netinet/if_ether.h
+++ b/include/netinet/if_ether.h
@@ -55,6 +55,7 @@
 #define ETH_P_8021AH	0x88E7
 #define ETH_P_MVRP	0x88F5
 #define ETH_P_1588	0x88F7
+#define ETH_P_NCSI	0x88F8
 #define ETH_P_PRP	0x88FB
 #define ETH_P_FCOE	0x8906
 #define ETH_P_TDLS	0x890D