diff --git a/code/modules/surgery/organs/organ.dm b/code/modules/surgery/organs/organ.dm
index 911de71e071..395848f26e0 100644
--- a/code/modules/surgery/organs/organ.dm
+++ b/code/modules/surgery/organs/organ.dm
@@ -57,7 +57,10 @@ var/list/organ_cache = list()
 /obj/item/organ/proc/set_dna(var/datum/dna/new_dna)
 	if(new_dna)
 		dna = new_dna.Clone()
-		blood_DNA = list()
+		if(blood_DNA)
+			blood_DNA.Cut()
+		else
+			blood_DNA = list()
 		blood_DNA[dna.unique_enzymes] = dna.b_type
 
 /obj/item/organ/proc/die()