diff --git a/PKHeX/MysteryGifts/PGT.cs b/PKHeX/MysteryGifts/PGT.cs
index c579e15b5..76f2322cd 100644
--- a/PKHeX/MysteryGifts/PGT.cs
+++ b/PKHeX/MysteryGifts/PGT.cs
@@ -100,7 +100,7 @@ public override PKM convertToPKM(SaveFile SAV)
             return Gift.convertToPKM(SAV);
         }
     }
-    public class PGT : MysteryGift
+    public sealed class PGT : MysteryGift
     {
         internal const int Size = 0x104; // 260
         public override int Format => 4;