diff --git a/code/modules/mob/living/carbon/human/species_types/dullahan.dm b/code/modules/mob/living/carbon/human/species_types/dullahan.dm
index ac399db644..5be3dcc9b6 100644
--- a/code/modules/mob/living/carbon/human/species_types/dullahan.dm
+++ b/code/modules/mob/living/carbon/human/species_types/dullahan.dm
@@ -145,7 +145,7 @@
 		hearers += owner
 
 /obj/item/dullahan_relay/proc/unlist_head(datum/source, noheal, list/excluded_limbs)
-	excluded_limbs += BODY_ZONE_HEAD // So we don't gib when regenerating limbs.
+	excluded_limbs |= BODY_ZONE_HEAD // So we don't gib when regenerating limbs.
 
 /obj/item/dullahan_relay/process()
 	if(!istype(loc, /obj/item/bodypart/head) || QDELETED(owner))
diff --git a/code/modules/surgery/bodyparts/dismemberment.dm b/code/modules/surgery/bodyparts/dismemberment.dm
index a847116a65..66e181bd98 100644
--- a/code/modules/surgery/bodyparts/dismemberment.dm
+++ b/code/modules/surgery/bodyparts/dismemberment.dm
@@ -334,10 +334,10 @@
 
 
 //Regenerates all limbs. Returns amount of limbs regenerated
-/mob/living/proc/regenerate_limbs(noheal, excluded_limbs)
+/mob/living/proc/regenerate_limbs(noheal = FALSE, list/excluded_limbs = list())
 	SEND_SIGNAL(src, COMSIG_LIVING_REGENERATE_LIMBS, noheal, excluded_limbs)
 
-/mob/living/carbon/regenerate_limbs(noheal, list/excluded_limbs)
+/mob/living/carbon/regenerate_limbs(noheal = FALSE, list/excluded_limbs = list())
 	. = ..()
 	var/list/limb_list = list(BODY_ZONE_HEAD, BODY_ZONE_CHEST, BODY_ZONE_R_ARM, BODY_ZONE_L_ARM, BODY_ZONE_R_LEG, BODY_ZONE_L_LEG)
 	if(excluded_limbs)