diff --git a/paper-server/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryAnvil.java b/paper-server/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryAnvil.java
index a91d81aeb4..46a1d38778 100644
--- a/paper-server/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryAnvil.java
+++ b/paper-server/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryAnvil.java
@@ -1,7 +1,9 @@
 package org.bukkit.craftbukkit.inventory;
 
 import net.minecraft.server.IInventory;
+
 import org.bukkit.inventory.AnvilInventory;
+import org.bukkit.inventory.ItemStack;
 
 public class CraftInventoryAnvil extends CraftInventory implements AnvilInventory {
     private final IInventory resultInventory;
@@ -19,6 +21,26 @@ public class CraftInventoryAnvil extends CraftInventory implements AnvilInventor
         return inventory;
     }
 
+    @Override
+    public ItemStack getItem(int slot) {
+        if (slot < getIngredientsInventory().getSize()) {
+            net.minecraft.server.ItemStack item = getIngredientsInventory().getItem(slot);
+            return item == null ? null : CraftItemStack.asCraftMirror(item);
+        } else {
+            net.minecraft.server.ItemStack item = getResultInventory().getItem(slot - getIngredientsInventory().getSize());
+            return item == null ? null : CraftItemStack.asCraftMirror(item);
+        }
+    }
+
+    @Override
+    public void setItem(int index, ItemStack item) {
+        if (index < getIngredientsInventory().getSize()) {
+            getIngredientsInventory().setItem(index, (item == null ? null : CraftItemStack.asNMSCopy(item)));
+        } else {
+            getResultInventory().setItem((index - getIngredientsInventory().getSize()), (item == null ? null : CraftItemStack.asNMSCopy(item)));
+        }
+    }
+
     @Override
     public int getSize() {
         return getResultInventory().getSize() + getIngredientsInventory().getSize();