diff --git a/code/modules/mob/living/simple_animal/friendly/butterfly.dm b/code/modules/mob/living/simple_animal/friendly/butterfly.dm
index e4f9e562e37..720d384d748 100644
--- a/code/modules/mob/living/simple_animal/friendly/butterfly.dm
+++ b/code/modules/mob/living/simple_animal/friendly/butterfly.dm
@@ -14,7 +14,8 @@
 	health = 2
 	harm_intent_damage = 1
 	friendly = "nudges"
-	pass_flags = PASSTABLE
+	density = 0
+	pass_flags = PASSTABLE | PASSGRILLE | PASSMOB
 	ventcrawler = 2
 	mob_size = MOB_SIZE_SMALL