diff --git a/Zennysoft.Game.Ma/src/game/Game.cs b/Zennysoft.Game.Ma/src/game/Game.cs
index 12b3000e..295bb0f6 100644
--- a/Zennysoft.Game.Ma/src/game/Game.cs
+++ b/Zennysoft.Game.Ma/src/game/Game.cs
@@ -791,7 +791,7 @@ public partial class Game : Node3D, IGame
         InventoryEventNotification.Invoke($"HP has been reduced to 1.");
         break;
       case UsableItemTag.DoubleStackedItems:
-        var stackableItems = _player.Inventory.Items.OfType<IStackable>().ToList();
+        var stackableItems = _player.Inventory.Items.OfType<IStackable>().Except([effectItem]).ToList();
         stackableItems.ForEach(x => x.Count.OnNext(x.Count.Value * 2));
         InventoryEventNotification.Invoke($"Items with inventory count have been doubled.");
         break;