diff --git a/sysdep/unix/krt.Y b/sysdep/unix/krt.Y
index 6d90db64..1cb28389 100644
--- a/sysdep/unix/krt.Y
+++ b/sysdep/unix/krt.Y
@@ -40,6 +40,7 @@ kif_set_preferred(ip_addr ip)
 CF_DECLS
 
 CF_KEYWORDS(KERNEL, PERSIST, SCAN, TIME, LEARN, DEVICE, ROUTES, GRACEFUL, RESTART, KRT_SOURCE, KRT_METRIC, MERGE, PATHS)
+CF_KEYWORDS(INTERFACE, PREFERRED)
 
 %type <i> kern_mp_limit