diff --git a/ArchiSteamFarm/Trading.cs b/ArchiSteamFarm/Trading.cs
index 74f564fb5..aaa699486 100644
--- a/ArchiSteamFarm/Trading.cs
+++ b/ArchiSteamFarm/Trading.cs
@@ -79,7 +79,7 @@ namespace ArchiSteamFarm {
 		}
 
 		[PublicAPI]
-		public static bool IsTradeNeutralOrBetter(HashSet<Steam.Asset> inventory, IReadOnlyCollection<Steam.Asset> itemsToGive, IReadOnlyCollection<Steam.Asset> itemsToReceive) {
+		public static bool IsTradeNeutralOrBetter(HashSet<Steam.Asset> inventory, ISet<Steam.Asset> itemsToGive, ISet<Steam.Asset> itemsToReceive) {
 			if ((inventory == null) || (inventory.Count == 0) || (itemsToGive == null) || (itemsToGive.Count == 0) || (itemsToReceive == null) || (itemsToReceive.Count == 0)) {
 				ASF.ArchiLogger.LogNullError(nameof(inventory) + " || " + nameof(itemsToGive) + " || " + nameof(itemsToReceive));
 
@@ -239,7 +239,7 @@ namespace ArchiSteamFarm {
 			return tradableState;
 		}
 
-		internal static HashSet<Steam.Asset> GetTradableItemsFromInventory(IReadOnlyCollection<Steam.Asset> inventory, IDictionary<ulong, uint> classIDs) {
+		internal static HashSet<Steam.Asset> GetTradableItemsFromInventory(ISet<Steam.Asset> inventory, IDictionary<ulong, uint> classIDs) {
 			if ((inventory == null) || (inventory.Count == 0) || (classIDs == null) || (classIDs.Count == 0)) {
 				ASF.ArchiLogger.LogNullError(nameof(inventory) + " || " + nameof(classIDs));