diff --git a/src/csharp/Grpc.Tools/Common.cs b/src/csharp/Grpc.Tools/Common.cs
index 13cd6a32316..187ed9d84cb 100644
--- a/src/csharp/Grpc.Tools/Common.cs
+++ b/src/csharp/Grpc.Tools/Common.cs
@@ -19,7 +19,6 @@
 using System;
 using System.IO;
 using System.Runtime.CompilerServices;
-using System.Runtime.InteropServices;
 using System.Security;
 
 [assembly: InternalsVisibleTo("Grpc.Tools.Tests")]
diff --git a/src/csharp/Grpc.Tools/GeneratorServices.cs b/src/csharp/Grpc.Tools/GeneratorServices.cs
index af4b64c2479..0ade66972f1 100644
--- a/src/csharp/Grpc.Tools/GeneratorServices.cs
+++ b/src/csharp/Grpc.Tools/GeneratorServices.cs
@@ -16,7 +16,6 @@
 
 #endregion
 
-using System;
 using System.IO;
 using System.Text;
 using Microsoft.Build.Framework;
diff --git a/src/csharp/Grpc.Tools/ProtoCompile.cs b/src/csharp/Grpc.Tools/ProtoCompile.cs
index e1f01a554bc..68bd7ef2e02 100644
--- a/src/csharp/Grpc.Tools/ProtoCompile.cs
+++ b/src/csharp/Grpc.Tools/ProtoCompile.cs
@@ -18,7 +18,6 @@
 
 using System;
 using System.Collections.Generic;
-using System.IO;
 using System.Text;
 using System.Text.RegularExpressions;
 using Microsoft.Build.Framework;
diff --git a/src/csharp/Grpc.Tools/ProtoCompilerOutputs.cs b/src/csharp/Grpc.Tools/ProtoCompilerOutputs.cs
index ea146ec090e..3300b3ef0c7 100644
--- a/src/csharp/Grpc.Tools/ProtoCompilerOutputs.cs
+++ b/src/csharp/Grpc.Tools/ProtoCompilerOutputs.cs
@@ -17,7 +17,6 @@
 #endregion
 
 using System.Collections.Generic;
-using System.IO;
 using Microsoft.Build.Framework;
 using Microsoft.Build.Utilities;