diff --git a/TLSharp.Core/Auth/Step3_CompleteDHExchange.cs b/TLSharp.Core/Auth/Step3_CompleteDHExchange.cs
index b1c69c1..c6c9a41 100644
--- a/TLSharp.Core/Auth/Step3_CompleteDHExchange.cs
+++ b/TLSharp.Core/Auth/Step3_CompleteDHExchange.cs
@@ -2,7 +2,6 @@
 using System.IO;
 using System.Linq;
 using System.Security.Cryptography;
-using System.Text;
 using TLSharp.Core.MTProto;
 using TLSharp.Core.MTProto.Crypto;