diff --git a/mods/ITEMS/mcl_potions/potions.lua b/mods/ITEMS/mcl_potions/potions.lua
index eaf6fd49cd..436b1e0a05 100644
--- a/mods/ITEMS/mcl_potions/potions.lua
+++ b/mods/ITEMS/mcl_potions/potions.lua
@@ -554,14 +554,14 @@ minetest.register_craftitem("mcl_potions:poison", {
 	stack_max = 1,
 
 	on_place = function(itemstack, user, pointed_thing)
-		mcl_potions.poison_func(user, 2.5, mcl_potions.DURATION*mcl_potions.INV_FACTOR*mcl_potions.INV_FACTOR)
+		mcl_potions.poison_func(user, 2.5, mcl_potions.DURATION*mcl_potions.INV_FACTOR^2)
 		minetest.do_item_eat(0, "mcl_potions:glass_bottle", itemstack, user, pointed_thing)
 		mcl_potions._use_potion(itemstack, user, "#225533")
 		return itemstack
 	end,
 
 	on_secondary_use = function(itemstack, user, pointed_thing)
-		mcl_potions.poison_func(user, 2.5, mcl_potions.DURATION*mcl_potions.INV_FACTOR*mcl_potions.INV_FACTOR)
+		mcl_potions.poison_func(user, 2.5, mcl_potions.DURATION*mcl_potions.INV_FACTOR^2)
 		minetest.do_item_eat(0, "mcl_potions:glass_bottle", itemstack, user, pointed_thing)
 		mcl_potions._use_potion(itemstack, user, "#225533")
 		return itemstack
@@ -578,14 +578,14 @@ minetest.register_craftitem("mcl_potions:poison_2", {
 	stack_max = 1,
 
 	on_place = function(itemstack, user, pointed_thing)
-		mcl_potions.poison_func(user, 1.2, mcl_potions.DURATION_2*mcl_potions.INV_FACTOR*mcl_potions.INV_FACTOR)
+		mcl_potions.poison_func(user, 1.2, mcl_potions.DURATION_2*mcl_potions.INV_FACTOR^2)
 		minetest.do_item_eat(0, "mcl_potions:glass_bottle", itemstack, user, pointed_thing)
 		mcl_potions._use_potion(itemstack, user, "#447755")
 		return itemstack
 	end,
 
 	on_secondary_use = function(itemstack, user, pointed_thing)
-		mcl_potions.poison_func(user, 1.2, mcl_potions.DURATION_2*mcl_potions.INV_FACTOR*mcl_potions.INV_FACTOR)
+		mcl_potions.poison_func(user, 1.2, mcl_potions.DURATION_2*mcl_potions.INV_FACTOR^2)
 		minetest.do_item_eat(0, "mcl_potions:glass_bottle", itemstack, user, pointed_thing)
 		mcl_potions._use_potion(itemstack, user, "#447755")
 		return itemstack
diff --git a/mods/ITEMS/mcl_potions/splash.lua b/mods/ITEMS/mcl_potions/splash.lua
index 186c331a7b..e233dd9212 100644
--- a/mods/ITEMS/mcl_potions/splash.lua
+++ b/mods/ITEMS/mcl_potions/splash.lua
@@ -179,18 +179,18 @@ register_splash("slowness_plus", "Splash Slowness +", "#000066", {
 })
 
 register_splash("poison", "Splash Poison", "#335544", {
-		potion_fun = function(player, redx) mcl_potions.poison_func(player, 2.5, splash_DUR*mcl_potions.INV_FACTOR*redx) end,
-		tt = "-1/2 heart / 2.5sec | "..time_string(splash_DUR*mcl_potions.INV_FACTOR)
+		potion_fun = function(player, redx) mcl_potions.poison_func(player, 2.5, splash_DUR*mcl_potions.INV_FACTOR^2*redx) end,
+		tt = "-1/2 heart / 2.5sec | "..time_string(splash_DUR*mcl_potions.INV_FACTOR^2)
 })
 
 register_splash("poison_2", "Splash Poison II", "#446655", {
-		potion_fun = function(player, redx) mcl_potions.poison_func(player, 1.2, splash_DUR_2*mcl_potions.INV_FACTOR*redx) end,
-		tt = "-1/2 heart / 1.2sec | "..time_string(splash_DUR_2*mcl_potions.INV_FACTOR)
+		potion_fun = function(player, redx) mcl_potions.poison_func(player, 1.2, splash_DUR_2*mcl_potions.INV_FACTOR^2*redx) end,
+		tt = "-1/2 heart / 1.2sec | "..time_string(splash_DUR_2*mcl_potions.INV_FACTOR^2)
 })
 
 register_splash("poison_plus", "Splash Poison +", "#557766", {
-		potion_fun = function(player, redx) mcl_potions.poison_func(player, 2.5, splash_DUR_pl*mcl_potions.INV_FACTOR*redx) end,
-		tt = "-1/2 heart / 2.5sec | "..time_string(splash_DUR_pl*mcl_potions.INV_FACTOR)
+		potion_fun = function(player, redx) mcl_potions.poison_func(player, 2.5, splash_DUR*mcl_potions.INV_FACTOR*redx) end,
+		tt = "-1/2 heart / 2.5sec | "..time_string(splash_DUR_pl*mcl_potions.INV_FACTOR^2)
 })
 
 register_splash("regeneration", "Splash Regeneration", "#A52BB2", {