diff --git a/nest/route.h b/nest/route.h
index e372e164..aa39a472 100644
--- a/nest/route.h
+++ b/nest/route.h
@@ -268,6 +268,7 @@ typedef struct rta {
 #define RTD_BLACKHOLE 2			/* Silently drop packets */
 #define RTD_UNREACHABLE 3		/* Reject as unreachable */
 #define RTD_PROHIBIT 4			/* Administratively prohibited */
+#define RTD_NONE 5			/* Invalid RTD */
 
 #define RTAF_CACHED 1			/* This is a cached rta */