diff --git a/src/main/kotlin/net/shadowfacts/phycon/network/block/terminal/TerminalBlockEntity.kt b/src/main/kotlin/net/shadowfacts/phycon/network/block/terminal/TerminalBlockEntity.kt
index 5c7c2f4..a0a79bd 100644
--- a/src/main/kotlin/net/shadowfacts/phycon/network/block/terminal/TerminalBlockEntity.kt
+++ b/src/main/kotlin/net/shadowfacts/phycon/network/block/terminal/TerminalBlockEntity.kt
@@ -1,5 +1,6 @@
 package net.shadowfacts.phycon.network.block.terminal
 
+import alexiil.mc.lib.attributes.item.ItemStackCollections
 import net.minecraft.item.ItemStack
 import net.shadowfacts.phycon.api.packet.Packet
 import net.shadowfacts.phycon.init.PhyBlockEntities
@@ -12,7 +13,7 @@ import net.shadowfacts.phycon.network.packet.RequestReadAllPacket
  */
 class TerminalBlockEntity: DeviceBlockEntity(PhyBlockEntities.TERMINAL) {
 
-	private var cachedItems = mutableMapOf<ItemStack, Int>()
+	private var cachedItems = ItemStackCollections.intMap()
 
 	override fun handlePacket(packet: Packet) {
 		when (packet) {
@@ -22,7 +23,7 @@ class TerminalBlockEntity: DeviceBlockEntity(PhyBlockEntities.TERMINAL) {
 
 	fun handleReadAll(packet: ReadAllPacket) {
 		packet.items.forEach { (stack, amount) ->
-			cachedItems.merge(stack, amount) { a, b -> a + b }
+			cachedItems.mergeInt(stack, amount) { a, b -> a + b }
 		}
 		println("new cached items: $cachedItems")
 	}