diff --git a/plugin/src/main/java/lol/pyr/znpcsplus/entity/serializers/ItemStackPropertySerializer.java b/plugin/src/main/java/lol/pyr/znpcsplus/entity/serializers/ItemStackPropertySerializer.java
index d9f59d2..c6f1cb5 100644
--- a/plugin/src/main/java/lol/pyr/znpcsplus/entity/serializers/ItemStackPropertySerializer.java
+++ b/plugin/src/main/java/lol/pyr/znpcsplus/entity/serializers/ItemStackPropertySerializer.java
@@ -1,18 +1,19 @@
 package lol.pyr.znpcsplus.entity.serializers;
 
+import com.github.retrooper.packetevents.protocol.item.ItemStack;
+import io.github.retrooper.packetevents.util.SpigotConversionUtil;
 import lol.pyr.znpcsplus.entity.PropertySerializer;
 import lol.pyr.znpcsplus.util.ItemSerializationUtil;
-import org.bukkit.inventory.ItemStack;
 
 public class ItemStackPropertySerializer implements PropertySerializer<ItemStack> {
     @Override
     public String serialize(ItemStack property) {
-        return ItemSerializationUtil.itemToB64(property);
+        return ItemSerializationUtil.itemToB64(SpigotConversionUtil.toBukkitItemStack(property));
     }
 
     @Override
     public ItemStack deserialize(String property) {
-        return ItemSerializationUtil.itemFromB64(property);
+        return SpigotConversionUtil.fromBukkitItemStack(ItemSerializationUtil.itemFromB64(property));
     }
 
     @Override