diff --git a/code/modules/reagents/recipes/toxin.dm b/code/modules/reagents/recipes/toxin.dm
index 5d6f2eddc7d..d23cddfee9c 100644
--- a/code/modules/reagents/recipes/toxin.dm
+++ b/code/modules/reagents/recipes/toxin.dm
@@ -52,6 +52,6 @@
 
 /datum/chemical_reaction/formaldehyde
 	result = list(/datum/reagent/toxin/formaldehyde = 3)
-	required_reagents = list(/datum/reagent/ethanol = 1, /datum/reagent/oxygen = 1, /datum/reagent/silver = 1)
+	required_reagents = list(/datum/reagent/ethanol = 1, /datum/reagent/water = 1, /datum/reagent/silver = 1)
 	minimum_temperature = 70 CELSIUS
 	maximum_temperature = (70 CELSIUS) + 100