diff --git a/code/datums/mutations/body.dm b/code/datums/mutations/body.dm
index e9464c72cbd..4eec0f4a91c 100644
--- a/code/datums/mutations/body.dm
+++ b/code/datums/mutations/body.dm
@@ -110,7 +110,7 @@
 	quality = NEGATIVE
 	text_gain_indication = "<span class='danger'>You twitch.</span>"
 
-/datum/mutation/human/tourettes/on_life(mob/living/carbon/human/owner)
+/datum/mutation/human/tourettes/on_life()
 	if(prob(10) && owner.stat == CONSCIOUS && !owner.IsStun())
 		owner.Stun(200)
 		switch(rand(1, 3))