diff --git a/code/defines/obj/decal.dm b/code/defines/obj/decal.dm
index 11d72fd9ff3..2bf96c3a304 100644
--- a/code/defines/obj/decal.dm
+++ b/code/defines/obj/decal.dm
@@ -119,6 +119,7 @@
 	icon_state = "xfloor1"
 	random_icon_states = list("xfloor1", "xfloor2", "xfloor3", "xfloor4", "xfloor5", "xfloor6", "xfloor7")
 	var/list/viruses = list()
+	blood_DNA = list()
 
 	Del()
 		for(var/datum/disease/D in viruses)