diff --git a/code/modules/mob/living/carbon/human/human_damage.dm b/code/modules/mob/living/carbon/human/human_damage.dm
index a0661e921b6e8..16ccf53d7aae0 100644
--- a/code/modules/mob/living/carbon/human/human_damage.dm
+++ b/code/modules/mob/living/carbon/human/human_damage.dm
@@ -143,19 +143,18 @@
 
 // Defined here solely to take species flags into account without having to recast at mob/living level.
 /mob/living/carbon/human/getOxyLoss()
-	if(!need_breathe())
+	if (!need_breathe())
 		return 0
-	else
-		var/obj/item/organ/internal/lungs/breathe_organ = internal_organs_by_name[species.breathing_organ]
-		if(!breathe_organ)
-			return maxHealth/2
-		return breathe_organ.get_oxygen_deprivation()
+	var/obj/item/organ/internal/lungs/lungs = internal_organs_by_name[species.breathing_organ]
+	if (!lungs)
+		return 100
+	return lungs.get_oxygen_deprivation()
 
 /mob/living/carbon/human/setOxyLoss(amount)
-	if(!need_breathe())
-		return 0
-	else
-		adjustOxyLoss(getOxyLoss()-amount)
+	if (!need_breathe())
+		return
+	amount = clamp(amount, 0, 100) / 100
+	adjustOxyLoss(amount * species.total_health)
 
 /mob/living/carbon/human/adjustOxyLoss(amount)
 	if(!need_breathe())