diff --git a/monster/humanoid/Guard/knight.arc b/monster/humanoid/Guard/knight.arc
index 4b249b4b1..889a4c94c 100644
--- a/monster/humanoid/Guard/knight.arc
+++ b/monster/humanoid/Guard/knight.arc
@@ -7,6 +7,7 @@ animation knight
 alive 1
 monster 1
 move_type walk
+is_guard 1
 sleep 1
 Wis 15
 see_invisible 1