diff --git a/src/Binance/Account/Orders/LimitMakerOrder.cs b/src/Binance/Account/Orders/LimitMakerOrder.cs
index 610c67b7..35dfc498 100644
--- a/src/Binance/Account/Orders/LimitMakerOrder.cs
+++ b/src/Binance/Account/Orders/LimitMakerOrder.cs
@@ -1,4 +1,5 @@
-using Binance.Api;
+using System;
+using Binance.Api;
 
 namespace Binance.Account.Orders
 {
@@ -8,6 +9,16 @@ public sealed class LimitMakerOrder : LimitOrder
 
         public override OrderType Type => OrderType.LimitMaker;
 
+        public override TimeInForce TimeInForce
+        {
+            get => TimeInForce.GTC;
+            set
+            {
+                if (value != TimeInForce.GTC)
+                    throw new ArgumentException($"{nameof(TimeInForce)} must be {TimeInForce.GTC}.");
+            }
+        }
+
         #endregion Public Properties
 
         #region Constructors
diff --git a/src/Binance/Account/Orders/LimitOrder.cs b/src/Binance/Account/Orders/LimitOrder.cs
index be05658b..ff38cf8f 100644
--- a/src/Binance/Account/Orders/LimitOrder.cs
+++ b/src/Binance/Account/Orders/LimitOrder.cs
@@ -14,17 +14,17 @@ public class LimitOrder : ClientOrder
         /// <summary>
         /// Get or set the price.
         /// </summary>
-        public decimal Price { get; set; }
+        public virtual decimal Price { get; set; }
 
         /// <summary>
         /// Get or set the iceberg quantity.
         /// </summary>
-        public decimal IcebergQuantity { get; set; }
+        public virtual decimal IcebergQuantity { get; set; }
 
         /// <summary>
         /// Get or set the time in force.
         /// </summary>
-        public TimeInForce TimeInForce { get; set; }
+        public virtual TimeInForce TimeInForce { get; set; }
 
         #endregion Public Properties
 
diff --git a/src/Binance/Api/BinanceApi.cs b/src/Binance/Api/BinanceApi.cs
index 5bd89bba..44184831 100644
--- a/src/Binance/Api/BinanceApi.cs
+++ b/src/Binance/Api/BinanceApi.cs
@@ -374,7 +374,7 @@ public virtual async Task<Order> PlaceAsync(ClientOrder clientOrder, long recvWi
 
             // Place the order.
             var json = await HttpClient.PlaceOrderAsync(clientOrder.User, clientOrder.Symbol, clientOrder.Side, clientOrder.Type,
-                clientOrder.Quantity, limitOrder?.Price ?? 0, clientOrder.Id, limitOrder?.TimeInForce,
+                clientOrder.Quantity, limitOrder?.Price ?? 0, clientOrder.Id, clientOrder.Type == OrderType.LimitMaker ? null : limitOrder?.TimeInForce,
                 stopOrder?.StopPrice ?? 0, limitOrder?.IcebergQuantity ?? 0, recvWindow, false, PlaceOrderResponseType.Result, token);
 
             try
@@ -402,7 +402,7 @@ public virtual async Task TestPlaceAsync(ClientOrder clientOrder, long recvWindo
 
             // Place the TEST order.
             var json = await HttpClient.PlaceOrderAsync(clientOrder.User, clientOrder.Symbol, clientOrder.Side, clientOrder.Type,
-                clientOrder.Quantity, limitOrder?.Price ?? 0, clientOrder.Id, limitOrder?.TimeInForce,
+                clientOrder.Quantity, limitOrder?.Price ?? 0, clientOrder.Id, clientOrder.Type == OrderType.LimitMaker ? null : limitOrder?.TimeInForce,
                 stopOrder?.StopPrice ?? 0, limitOrder?.IcebergQuantity ?? 0, recvWindow, true, token: token);
 
             if (json != SuccessfulTestResponse)
diff --git a/test/Binance.Tests/Integration/BinanceHttpClientTest.cs b/test/Binance.Tests/Integration/BinanceHttpClientTest.cs
index 7cfeaddd..29335512 100644
--- a/test/Binance.Tests/Integration/BinanceHttpClientTest.cs
+++ b/test/Binance.Tests/Integration/BinanceHttpClientTest.cs
@@ -90,11 +90,15 @@ public async Task Get24HourStatistics()
         }
 
         [Fact]
-        public async Task GetPrices()
+        public async Task GetPrice()
         {
-            var json = await _api.GetPricesAsync();
+            var json = await _api.GetPriceAsync();
 
             Assert.True(IsJsonArray(json));
+
+            json = await _api.GetPriceAsync(Symbol.BTC_USDT);
+
+            Assert.True(IsJsonObject(json));
         }
 
         [Fact]