diff --git a/src/Renci.SshNet/Security/KeyExchangeECCurve25519.cs b/src/Renci.SshNet/Security/KeyExchangeECCurve25519.cs
index 1fba1c20..b7a318bb 100644
--- a/src/Renci.SshNet/Security/KeyExchangeECCurve25519.cs
+++ b/src/Renci.SshNet/Security/KeyExchangeECCurve25519.cs
@@ -1,5 +1,4 @@
-using System;
-using Renci.SshNet.Abstractions;
+using Renci.SshNet.Abstractions;
 using Renci.SshNet.Common;
 using Renci.SshNet.Messages.Transport;
 using Renci.SshNet.Security.Chaos.NaCl;