diff --git a/FTX.Net/Clients/TradeApi/FTXClientTradeApiTrading.cs b/FTX.Net/Clients/TradeApi/FTXClientTradeApiTrading.cs
index 9af755f..b8b94c3 100644
--- a/FTX.Net/Clients/TradeApi/FTXClientTradeApiTrading.cs
+++ b/FTX.Net/Clients/TradeApi/FTXClientTradeApiTrading.cs
@@ -117,7 +117,7 @@ public async Task<WebCallResult<FTXTriggerOrder>> ModifyTriggerOrderAsync(long o
         }
 
         /// <inheritdoc />
-        public async Task<WebCallResult<FTXOrder>> ModifyOrderByClientOrderIdAsync(long clientOrderId, decimal? price = null, decimal? quantity = null, string? newClientOrderId = null, string? subaccountName = null, CancellationToken ct = default)
+        public async Task<WebCallResult<FTXOrder>> ModifyOrderByClientOrderIdAsync(string clientOrderId, decimal? price = null, decimal? quantity = null, string? newClientOrderId = null, string? subaccountName = null, CancellationToken ct = default)
         {
             var parameters = new Dictionary<string, object>();
             parameters.AddOptionalParameter("price", price?.ToString(CultureInfo.InvariantCulture));
diff --git a/FTX.Net/FTX.Net.xml b/FTX.Net/FTX.Net.xml
index 8ed2abf..6409bd8 100644
--- a/FTX.Net/FTX.Net.xml
+++ b/FTX.Net/FTX.Net.xml
@@ -467,7 +467,7 @@
         <member name="M:FTX.Net.Clients.TradeApi.FTXClientTradeApiTrading.ModifyTriggerOrderAsync(System.Int64,System.Nullable{System.Decimal},System.Nullable{System.Decimal},System.Nullable{System.Decimal},System.Nullable{System.Decimal},System.String,System.Threading.CancellationToken)">
             <inheritdoc />
         </member>
-        <member name="M:FTX.Net.Clients.TradeApi.FTXClientTradeApiTrading.ModifyOrderByClientOrderIdAsync(System.Int64,System.Nullable{System.Decimal},System.Nullable{System.Decimal},System.String,System.String,System.Threading.CancellationToken)">
+        <member name="M:FTX.Net.Clients.TradeApi.FTXClientTradeApiTrading.ModifyOrderByClientOrderIdAsync(System.String,System.Nullable{System.Decimal},System.Nullable{System.Decimal},System.String,System.String,System.Threading.CancellationToken)">
             <inheritdoc />
         </member>
         <member name="M:FTX.Net.Clients.TradeApi.FTXClientTradeApiTrading.GetOrderAsync(System.Int64,System.String,System.Threading.CancellationToken)">
@@ -2124,7 +2124,7 @@
             <param name="ct">Cancellation token</param>
             <returns></returns>
         </member>
-        <member name="M:FTX.Net.Interfaces.Clients.TradeApi.IFTXClientTradeApiTrading.ModifyOrderByClientOrderIdAsync(System.Int64,System.Nullable{System.Decimal},System.Nullable{System.Decimal},System.String,System.String,System.Threading.CancellationToken)">
+        <member name="M:FTX.Net.Interfaces.Clients.TradeApi.IFTXClientTradeApiTrading.ModifyOrderByClientOrderIdAsync(System.String,System.Nullable{System.Decimal},System.Nullable{System.Decimal},System.String,System.String,System.Threading.CancellationToken)">
             <summary>
             Modify an order. Will internally cancel the original order and place a new order with the new price/quantity. The new order will have a new order id. Note: there's a chance that the order meant to be canceled gets filled and its replacement still gets placed.
             <para><a href="https://docs.ftx.com/#modify-order-by-client-id" /></para>
diff --git a/FTX.Net/Interfaces/Clients/TradeApi/IFTXClientTradeApiTrading.cs b/FTX.Net/Interfaces/Clients/TradeApi/IFTXClientTradeApiTrading.cs
index 30edf1d..36d08cc 100644
--- a/FTX.Net/Interfaces/Clients/TradeApi/IFTXClientTradeApiTrading.cs
+++ b/FTX.Net/Interfaces/Clients/TradeApi/IFTXClientTradeApiTrading.cs
@@ -101,7 +101,7 @@ Task<WebCallResult<FTXTriggerOrder>> PlaceTriggerOrderAsync(
         /// <param name="subaccountName">Subaccount name to execute this request for</param>
         /// <param name="ct">Cancellation token</param>
         /// <returns></returns>
-        Task<WebCallResult<FTXOrder>> ModifyOrderByClientOrderIdAsync(long clientOrderId, decimal? price = null, decimal? quantity = null, string? newClientOrderId = null, string? subaccountName = null, CancellationToken ct = default);
+        Task<WebCallResult<FTXOrder>> ModifyOrderByClientOrderIdAsync(string clientOrderId, decimal? price = null, decimal? quantity = null, string? newClientOrderId = null, string? subaccountName = null, CancellationToken ct = default);
 
         /// <summary>
         /// Get the status of an order