diff --git a/shadowsocks-csharp/Controller/Service/TCPRelay.cs b/shadowsocks-csharp/Controller/Service/TCPRelay.cs
index 855eed24..5c9de444 100644
--- a/shadowsocks-csharp/Controller/Service/TCPRelay.cs
+++ b/shadowsocks-csharp/Controller/Service/TCPRelay.cs
@@ -434,7 +434,7 @@ namespace Shadowsocks.Controller
 
                 StartPipe();
             }
-            catch (ArgumentException e)
+            catch (ArgumentException)
             {
             }
             catch (Exception e)