diff --git a/cybersyn/scripts/factorio-api.lua b/cybersyn/scripts/factorio-api.lua
index 77d0ac6..005fbfc 100644
--- a/cybersyn/scripts/factorio-api.lua
+++ b/cybersyn/scripts/factorio-api.lua
@@ -14,7 +14,7 @@ local DEFINES_LOW_POWER = defines.entity_status.low_power
 ---@param map_data MapData
 ---@param item_name string
 function get_stack_size(map_data, item_name)
-	return game.item_prototypes[item_name].stack_size
+	return prototypes.item[item_name].stack_size
 end
 
 ---@param item_order table<string, int>
@@ -756,7 +756,7 @@ function set_comb2(map_data, station)
 		local signals = {}
 		for item_name, count in pairs(deliveries) do
 			local i = #signals + 1
-			local is_fluid = game.item_prototypes[item_name] == nil--NOTE: this is expensive
+			local is_fluid = prototypes.item[item_name] == nil--NOTE: this is expensive
 			signals[i] = {index = i, signal = {type = is_fluid and "fluid" or "item", name = item_name}, count = sign*count}
 		end
 		set_combinator_output(map_data, station.entity_comb2, signals)
diff --git a/cybersyn/scripts/gui/main.lua b/cybersyn/scripts/gui/main.lua
index 374dac8..5edcdb7 100644
--- a/cybersyn/scripts/gui/main.lua
+++ b/cybersyn/scripts/gui/main.lua
@@ -135,7 +135,7 @@ local function init_items(manager)
 	manager.item_order = item_order
 	local i = 1
 
-	for _, protos in pairs{game.item_prototypes, game.fluid_prototypes} do
+	for _, protos in pairs{prototypes.item, game.fluid_prototypes} do
 		--- @type (LuaItemPrototype|LuaFluidPrototype)[]
 		local all_items = {}
 		for _, proto in pairs(protos) do
diff --git a/cybersyn/scripts/layout.lua b/cybersyn/scripts/layout.lua
index cc01dc9..f7187e0 100644
--- a/cybersyn/scripts/layout.lua
+++ b/cybersyn/scripts/layout.lua
@@ -378,7 +378,7 @@ function set_refueler_combs(map_data, refueler, train)
 					else
 						name = a.name
 					end
-					if game.item_prototypes[name] then
+					if prototypes.item[name] then
 						wagon_signals[1] = {index = 1, signal = {type = "item", name = a.name}, count = 1}
 					end
 				end