diff --git a/PKHeX.Core/Saves/Substructures/Gen5/BattleSubway5.cs b/PKHeX.Core/Saves/Substructures/Gen5/BattleSubway5.cs
index 472e8a69a..b6e4a5e40 100644
--- a/PKHeX.Core/Saves/Substructures/Gen5/BattleSubway5.cs
+++ b/PKHeX.Core/Saves/Substructures/Gen5/BattleSubway5.cs
@@ -65,8 +65,8 @@ public int MultiFriendsRecord
         // Super Check
         public int SuperCheck
         {
-            get => BitConverter.ToUInt16(Data, Offset + 0x04);
-            set => BitConverter.GetBytes((ushort)value).CopyTo(Data, Offset + 0x04);
+            get => Data[Offset + 0x04];
+            set => Data[Offset + 0x04] = (byte)value;
         }
 
         // Super