diff --git a/code/modules/zombie/organs.dm b/code/modules/zombie/organs.dm
index e0c6a9da9b5..28e6d9499f9 100644
--- a/code/modules/zombie/organs.dm
+++ b/code/modules/zombie/organs.dm
@@ -26,7 +26,6 @@
 /obj/item/organ/zombie_infection/Insert(var/mob/living/carbon/M, special = 0)
 	. = ..()
 	START_PROCESSING(SSobj, src)
-	old_species = M.dna.species.type
 
 /obj/item/organ/zombie_infection/Remove(mob/living/carbon/M, special = 0)
 	. = ..()