diff --git a/Maple2.Server.Game/Manager/Items/InventoryManager.cs b/Maple2.Server.Game/Manager/Items/InventoryManager.cs
index 531d1bc8a..ceceec518 100644
--- a/Maple2.Server.Game/Manager/Items/InventoryManager.cs
+++ b/Maple2.Server.Game/Manager/Items/InventoryManager.cs
@@ -200,8 +200,7 @@ public bool Add(Item add, bool notifyNew = false, bool commit = false) {
                 add.Transfer?.Bind(session.Player.Value.Character);
             }
 
-            bool stack = !(add.ExpiryTime > 0);
-            IList<(Item, int Added)> result = items.Add(add, stack);
+            IList<(Item, int Added)> result = items.Add(add, stack: true);
             if (result.Count == 0) {
                 session.Send(ItemInventoryPacket.Error(s_err_inventory));
                 return false;
diff --git a/Maple2.Server.Game/Manager/Items/ItemCollection.cs b/Maple2.Server.Game/Manager/Items/ItemCollection.cs
index 94d700289..b4bc67f7f 100644
--- a/Maple2.Server.Game/Manager/Items/ItemCollection.cs
+++ b/Maple2.Server.Game/Manager/Items/ItemCollection.cs
@@ -143,7 +143,7 @@ private bool Append(Item insert) {
         // Prefer item slot if specified
         if (ValidSlot(add.Slot) && this[add.Slot] == null) {
             this[add.Slot] = add;
-            return new[] { (add, add.Amount) };
+            return [(add, add.Amount)];
         }
 
         IList<(Item, int Added)> result = new List<(Item, int)>();
@@ -318,7 +318,8 @@ private static bool CanStack(Item item, Item stack) {
         return item.Id == stack.Id
                && item.Rarity == stack.Rarity
                && item.Amount < item.Metadata.Property.SlotMax
-               && Equals(item.Transfer, stack.Transfer);
+               && Equals(item.Transfer, stack.Transfer)
+               && item.ExpiryTime / 60 == stack.ExpiryTime / 60; // Expiry time is in seconds, convert to minutes
     }
 
     private static int SortItem(Item? x, Item? y) {