diff --git a/code/datums/diseases/advance/symptoms/sensory.dm b/code/datums/diseases/advance/symptoms/sensory.dm
index 0d1dd15b15c..66dafbd5793 100644
--- a/code/datums/diseases/advance/symptoms/sensory.dm
+++ b/code/datums/diseases/advance/symptoms/sensory.dm
@@ -24,9 +24,9 @@ Bonus
 	level = 5
 	severity = 0
 
-/datum/symptom/sensory_restoration/proc/check_and_add(var/reagent, var/check, var/add, var/mob/living/M)
+/datum/symptom/sensory_restoration/proc/check_and_add(reagent, check, add, /mob/living/M)
 	if(M.reagents.get_reagent_amount(reagent) < check)
-		M.reagents.add_reagent(reagent, check)
+		M.reagents.add_reagent(reagent, add)
 		return 1
 
 /datum/symptom/sensory_restoration/Activate(var/datum/disease/advance/A)