diff --git a/route/sys_openbsd.go b/route/sys_openbsd.go
index 038fb77..21f1d3d 100644
--- a/route/sys_openbsd.go
+++ b/route/sys_openbsd.go
@@ -73,7 +73,6 @@
 		unix.RTM_LOSING:     rtm,
 		unix.RTM_REDIRECT:   rtm,
 		unix.RTM_MISS:       rtm,
-		unix.RTM_LOCK:       rtm,
 		unix.RTM_RESOLVE:    rtm,
 		unix.RTM_NEWADDR:    ifam,
 		unix.RTM_DELADDR:    ifam,