diff --git a/code/modules/mob/living/simple_animal/hostile/headslug.dm b/code/modules/mob/living/simple_animal/hostile/headslug.dm
index be34f9ff999..55c1d05008c 100644
--- a/code/modules/mob/living/simple_animal/hostile/headslug.dm
+++ b/code/modules/mob/living/simple_animal/hostile/headslug.dm
@@ -21,6 +21,7 @@
 	environment_smash = 0
 	speak_emote = list("squeaks")
 	pass_flags = PASSTABLE | PASSMOB
+	mob_size = MOB_SIZE_SMALL
 	density = FALSE
 	ventcrawler = VENTCRAWLER_ALWAYS
 	a_intent = INTENT_HARM