diff --git a/code/modules/mob/living/simple_animal/hostile/headslug.dm b/code/modules/mob/living/simple_animal/hostile/headslug.dm
index 6800598fc7f..d53a5f033f6 100644
--- a/code/modules/mob/living/simple_animal/hostile/headslug.dm
+++ b/code/modules/mob/living/simple_animal/hostile/headslug.dm
@@ -19,6 +19,8 @@
 	obj_damage = 0
 	environment_smash = 0
 	speak_emote = list("squeaks")
+	pass_flags = PASSTABLE | PASSMOB
+	density = FALSE
 	ventcrawler = 2
 	var/datum/mind/origin
 	var/egg_lain = 0