diff --git a/code/modules/mob/living/carbon/human/human.dm b/code/modules/mob/living/carbon/human/human.dm
index 0007233975..90daa2633a 100644
--- a/code/modules/mob/living/carbon/human/human.dm
+++ b/code/modules/mob/living/carbon/human/human.dm
@@ -816,7 +816,7 @@
 	for(var/datum/mutation/human/HM in dna.mutations)
 		if(HM.quality != POSITIVE)
 			dna.remove_mutation(HM.name)
-	if(blood_volume < (BLOOD_VOLUME_NORMAL*blood_ratio))
+	if(blood_volume < (BLOOD_VOLUME_NORMAL*blood_ratio) && !isvamp())
 		blood_volume = (BLOOD_VOLUME_NORMAL*blood_ratio)
 	..()