diff --git a/sys/net/route/route_ctl.c b/sys/net/route/route_ctl.c
--- a/sys/net/route/route_ctl.c
+++ b/sys/net/route/route_ctl.c
@@ -28,6 +28,7 @@
 #include <sys/cdefs.h>
 #include "opt_inet.h"
 #include "opt_inet6.h"
+#include "opt_route.h"
 
 #include <sys/param.h>
 #include <sys/systm.h>