diff --git a/Source/Client/Syncing/Game/SyncDelegates.cs b/Source/Client/Syncing/Game/SyncDelegates.cs
index 00445879..8a4b2432 100644
--- a/Source/Client/Syncing/Game/SyncDelegates.cs
+++ b/Source/Client/Syncing/Game/SyncDelegates.cs
@@ -5,6 +5,7 @@
 using HarmonyLib;
 using Multiplayer.API;
 using Multiplayer.Client.Patches;
+using Multiplayer.Common;
 using MultiplayerLoader;
 using RimWorld;
 using RimWorld.Planet;
@@ -351,7 +352,8 @@ private static void InitChoiceLetters()
 
             // Growth moment for a child
             CloseDialogsForExpiredLetters.RegisterDefaultLetterChoice(AccessTools.Method(typeof(SyncDelegates), nameof(PickRandomTraitAndPassions)), typeof(ChoiceLetter_GrowthMoment));
-            SyncMethod.Register(typeof(ChoiceLetter_GrowthMoment), nameof(ChoiceLetter_GrowthMoment.MakeChoices)).ExposeParameter(1);
+            SyncMethod.Register(typeof(ChoiceLetter_GrowthMoment), nameof(ChoiceLetter_GrowthMoment.MakeChoices))
+                .TransformArgument(1, TraitSerializer);
 
             // Creep joiner
             SyncMethod.LambdaInGetter(typeof(ChoiceLetter_AcceptCreepJoiner), nameof(ChoiceLetter_AcceptCreepJoiner.Choices), 0); // Accept joiner
@@ -361,6 +363,24 @@ private static void InitChoiceLetters()
                     .method); // Reject joiner
         }
 
+        private static readonly SyncType TraitType = new(typeof(Trait)) { expose = true };
+        private static readonly Serializer<Trait, byte[]> TraitSerializer = Serializer.New<Trait, byte[]>(trait =>
+        {
+            if (trait == ChoiceLetter_GrowthMoment.NoTrait) return [0];
+
+            var writer = new ByteWriter();
+            writer.WriteByte(1);
+            SyncSerialization.WriteSyncObject(writer, trait, TraitType);
+            return writer.ToArray();
+        }, bytes =>
+        {
+            var reader = new ByteReader(bytes);
+            var tag = reader.ReadByte();
+            if (tag == 0) return ChoiceLetter_GrowthMoment.NoTrait;
+
+            return (Trait)SyncSerialization.ReadSyncObject(reader, TraitType);
+        });
+
         static void SyncBabyToChildLetter(ChoiceLetter_BabyToChild letter)
         {
             if (letter.bornSlave)