diff --git a/src/main/java/com/minelittlepony/unicopia/ability/magic/MultiSpellSlot.java b/src/main/java/com/minelittlepony/unicopia/ability/magic/MultiSpellSlot.java
index 0951bc5f..470a6a51 100644
--- a/src/main/java/com/minelittlepony/unicopia/ability/magic/MultiSpellSlot.java
+++ b/src/main/java/com/minelittlepony/unicopia/ability/magic/MultiSpellSlot.java
@@ -20,6 +20,7 @@ import com.minelittlepony.unicopia.util.serialization.NbtSerialisable;
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
 import net.minecraft.nbt.NbtCompound;
+import net.minecraft.network.PacketByteBuf;
 import net.minecraft.network.RegistryByteBuf;
 import net.minecraft.network.codec.PacketCodecs;
 import net.minecraft.registry.RegistryWrapper.WrapperLookup;
@@ -165,7 +166,7 @@ class MultiSpellSlot implements SpellSlots, NbtSerialisable {
         @Override
         public Optional<? extends ByteBuf> write(Status status, WrapperLookup lookup) {
             if (status != Status.DEFAULT) {
-                ByteBuf buffer = Unpooled.buffer();
+                ByteBuf buffer = new PacketByteBuf(Unpooled.buffer());
                 buffer.writeByte(1);
                 PacketCodecs.NBT_COMPOUND.encode(buffer, spell.toNBT(lookup));
                 return Optional.of(buffer);
diff --git a/src/main/java/com/minelittlepony/unicopia/util/serialization/PacketCodecUtils.java b/src/main/java/com/minelittlepony/unicopia/util/serialization/PacketCodecUtils.java
index bf3d1ccc..0832e68a 100644
--- a/src/main/java/com/minelittlepony/unicopia/util/serialization/PacketCodecUtils.java
+++ b/src/main/java/com/minelittlepony/unicopia/util/serialization/PacketCodecUtils.java
@@ -20,13 +20,13 @@ import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.Vec3d;
 
 public interface PacketCodecUtils {
-    PacketCodec<PacketByteBuf, PacketByteBuf> BUFFER = PacketCodec.of((buffer, bytes) -> {
+    PacketCodec<PacketByteBuf, PacketByteBuf> BUFFER = PacketCodec.of((bytes, buffer) -> {
         buffer.writeInt(bytes.writerIndex());
         buffer.writeBytes(bytes);
     }, buffer -> new PacketByteBuf(buffer.readBytes(buffer.readInt())));
     PacketCodec<PacketByteBuf, Optional<PacketByteBuf>> OPTIONAL_BUFFER = PacketCodecs.optional(BUFFER);
 
-    PacketCodec<RegistryByteBuf, ByteBuf> REGISTRY_BUFFER = PacketCodec.of((buffer, bytes) -> {
+    PacketCodec<RegistryByteBuf, ByteBuf> REGISTRY_BUFFER = PacketCodec.of((bytes, buffer) -> {
         buffer.writeInt(bytes.writerIndex());
         buffer.writeBytes(bytes);
     }, buffer -> new RegistryByteBuf(buffer.readBytes(buffer.readInt()), buffer.getRegistryManager()));