diff --git a/src/Renci.SshNet/Abstractions/DiagnosticAbstraction.cs b/src/Renci.SshNet/Abstractions/DiagnosticAbstraction.cs
index 0a41c5cb..6fc1308e 100644
--- a/src/Renci.SshNet/Abstractions/DiagnosticAbstraction.cs
+++ b/src/Renci.SshNet/Abstractions/DiagnosticAbstraction.cs
@@ -1,5 +1,4 @@
-using System;
-using System.Diagnostics;
+using System.Diagnostics;
 #if FEATURE_DIAGNOSTICS_TRACESOURCE
 using System.Threading;
 #endif // FEATURE_DIAGNOSTICS_TRACESOURCE
diff --git a/src/Renci.SshNet/AuthenticationMethod.cs b/src/Renci.SshNet/AuthenticationMethod.cs
index 294f5dbd..1a285d8c 100644
--- a/src/Renci.SshNet/AuthenticationMethod.cs
+++ b/src/Renci.SshNet/AuthenticationMethod.cs
@@ -1,6 +1,5 @@
 using Renci.SshNet.Common;
 using System;
-using System.Collections.Generic;
 
 namespace Renci.SshNet
 {
diff --git a/src/Renci.SshNet/IAuthenticationMethod.cs b/src/Renci.SshNet/IAuthenticationMethod.cs
index 6f5551ec..3fd78b09 100644
--- a/src/Renci.SshNet/IAuthenticationMethod.cs
+++ b/src/Renci.SshNet/IAuthenticationMethod.cs
@@ -1,6 +1,4 @@
-using System.Collections.Generic;
-
-namespace Renci.SshNet
+namespace Renci.SshNet
 {
     /// <summary>
     /// Base interface for authentication of a session using a given method.
diff --git a/src/Renci.SshNet/Sftp/ISftpFileReader.cs b/src/Renci.SshNet/Sftp/ISftpFileReader.cs
index bab6151c..684cc418 100644
--- a/src/Renci.SshNet/Sftp/ISftpFileReader.cs
+++ b/src/Renci.SshNet/Sftp/ISftpFileReader.cs
@@ -1,7 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
 
 namespace Renci.SshNet.Sftp
 {