diff --git a/Capnp.Net.Runtime/Rpc/TcpRpcClient.cs b/Capnp.Net.Runtime/Rpc/TcpRpcClient.cs
index 163600b..02a975d 100644
--- a/Capnp.Net.Runtime/Rpc/TcpRpcClient.cs
+++ b/Capnp.Net.Runtime/Rpc/TcpRpcClient.cs
@@ -1,6 +1,7 @@
 using Capnp.FrameTracing;
 using Microsoft.Extensions.Logging;
 using System;
+using System.IO;
 using System.Net;
 using System.Net.Sockets;
 using System.Threading;