diff --git a/code/modules/reagents/chemistry/reagents/medicine_reagents.dm b/code/modules/reagents/chemistry/reagents/medicine_reagents.dm
index ded0cc1f3da..86978985ff8 100644
--- a/code/modules/reagents/chemistry/reagents/medicine_reagents.dm
+++ b/code/modules/reagents/chemistry/reagents/medicine_reagents.dm
@@ -261,11 +261,11 @@
 	ph = 8.1
 	chemical_flags = REAGENT_CAN_BE_SYNTHESIZED
 
-/datum/reagent/medicine/spaceacillin/on_mob_metabolize(mob/living/L)
+/datum/reagent/medicine/spaceacillin/on_mob_add(mob/living/L)
 	. = ..()
 	ADD_TRAIT(L, TRAIT_VIRUS_RESISTANCE, type)
 
-/datum/reagent/medicine/spaceacillin/on_mob_end_metabolize(mob/living/L)
+/datum/reagent/medicine/spaceacillin/on_mob_delete(mob/living/L)
 	. = ..()
 	REMOVE_TRAIT(L, TRAIT_VIRUS_RESISTANCE, type)