diff --git a/PKHeX.Core/Saves/Substructures/Gen8/TrainerCard8.cs b/PKHeX.Core/Saves/Substructures/Gen8/TrainerCard8.cs
index 7e7fb08dd..3e65a4c23 100644
--- a/PKHeX.Core/Saves/Substructures/Gen8/TrainerCard8.cs
+++ b/PKHeX.Core/Saves/Substructures/Gen8/TrainerCard8.cs
@@ -16,7 +16,7 @@ public string OT
         public int TrainerID
         {
             get => BitConverter.ToInt32(Data, 0x1C);
-            set => SAV.SetData(BitConverter.GetBytes(value), 0x1C);
+            set => SAV.SetData(Data, BitConverter.GetBytes(value), 0x1C);
         }
 
         public string Number