diff --git a/Plugin/src/main/java/com/willfp/ecoenchants/display/packets/PacketOpenWindowMerchant.java b/Plugin/src/main/java/com/willfp/ecoenchants/display/packets/PacketOpenWindowMerchant.java
index c106e970..1be91492 100644
--- a/Plugin/src/main/java/com/willfp/ecoenchants/display/packets/PacketOpenWindowMerchant.java
+++ b/Plugin/src/main/java/com/willfp/ecoenchants/display/packets/PacketOpenWindowMerchant.java
@@ -10,7 +10,7 @@ import org.bukkit.inventory.MerchantRecipe;
 import java.util.List;
 import java.util.stream.Collectors;
 
-public class PacketOpenWindowMerchant extends AbstractPacketAdapter {
+public final class PacketOpenWindowMerchant extends AbstractPacketAdapter {
     private PacketOpenWindowMerchant() {
         super(PacketType.Play.Server.OPEN_WINDOW_MERCHANT);
     }
diff --git a/Plugin/src/main/java/com/willfp/ecoenchants/display/packets/PacketSetCreativeSlot.java b/Plugin/src/main/java/com/willfp/ecoenchants/display/packets/PacketSetCreativeSlot.java
index 35bd4673..f029a80c 100644
--- a/Plugin/src/main/java/com/willfp/ecoenchants/display/packets/PacketSetCreativeSlot.java
+++ b/Plugin/src/main/java/com/willfp/ecoenchants/display/packets/PacketSetCreativeSlot.java
@@ -5,7 +5,7 @@ import com.comphenix.protocol.events.PacketContainer;
 import com.willfp.ecoenchants.display.AbstractPacketAdapter;
 import com.willfp.ecoenchants.display.EnchantDisplay;
 
-public class PacketSetCreativeSlot extends AbstractPacketAdapter {
+public final class PacketSetCreativeSlot extends AbstractPacketAdapter {
     private PacketSetCreativeSlot() {
         super(PacketType.Play.Client.SET_CREATIVE_SLOT);
     }
diff --git a/Plugin/src/main/java/com/willfp/ecoenchants/display/packets/PacketSetSlot.java b/Plugin/src/main/java/com/willfp/ecoenchants/display/packets/PacketSetSlot.java
index 16fb75c2..79e89a81 100644
--- a/Plugin/src/main/java/com/willfp/ecoenchants/display/packets/PacketSetSlot.java
+++ b/Plugin/src/main/java/com/willfp/ecoenchants/display/packets/PacketSetSlot.java
@@ -5,7 +5,7 @@ import com.comphenix.protocol.events.PacketContainer;
 import com.willfp.ecoenchants.display.AbstractPacketAdapter;
 import com.willfp.ecoenchants.display.EnchantDisplay;
 
-public class PacketSetSlot extends AbstractPacketAdapter {
+public final class PacketSetSlot extends AbstractPacketAdapter {
     private PacketSetSlot() {
         super(PacketType.Play.Server.SET_SLOT);
     }
diff --git a/Plugin/src/main/java/com/willfp/ecoenchants/display/packets/PacketWindowItems.java b/Plugin/src/main/java/com/willfp/ecoenchants/display/packets/PacketWindowItems.java
index 544ad98c..0cc36b5d 100644
--- a/Plugin/src/main/java/com/willfp/ecoenchants/display/packets/PacketWindowItems.java
+++ b/Plugin/src/main/java/com/willfp/ecoenchants/display/packets/PacketWindowItems.java
@@ -5,7 +5,7 @@ import com.comphenix.protocol.events.PacketContainer;
 import com.willfp.ecoenchants.display.AbstractPacketAdapter;
 import com.willfp.ecoenchants.display.EnchantDisplay;
 
-public class PacketWindowItems extends AbstractPacketAdapter {
+public final class PacketWindowItems extends AbstractPacketAdapter {
     private PacketWindowItems() {
         super(PacketType.Play.Server.WINDOW_ITEMS);
     }