diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index d263853a8f1c..d572d5376319 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -199,6 +199,7 @@ enum
 #define RTPROT_BIRD	12	/* BIRD */
 #define RTPROT_DNROUTED	13	/* DECnet routing daemon */
 #define RTPROT_XORP	14	/* XORP */
+#define RTPROT_NTK	15	/* Netsukuku */
 
 /* rtm_scope