diff --git a/src/Microsoft.AspNetCore.Server.HttpSys/HttpSysListener.cs b/src/Microsoft.AspNetCore.Server.HttpSys/HttpSysListener.cs
index f5efd41533..a42c1f9af4 100644
--- a/src/Microsoft.AspNetCore.Server.HttpSys/HttpSysListener.cs
+++ b/src/Microsoft.AspNetCore.Server.HttpSys/HttpSysListener.cs
@@ -14,7 +14,7 @@ namespace Microsoft.AspNetCore.Server.HttpSys
     /// <summary>
     /// An HTTP server wrapping the Http.Sys APIs that accepts requests.
     /// </summary>
-    public sealed class HttpSysListener : IDisposable
+    internal class HttpSysListener : IDisposable
     {
         // Win8# 559317 fixed a bug in Http.sys's HttpReceiveClientCertificate method.
         // Without this fix IOCP callbacks were not being called although ERROR_IO_PENDING was
diff --git a/src/Microsoft.AspNetCore.Server.HttpSys/RequestProcessing/HeaderCollection.cs b/src/Microsoft.AspNetCore.Server.HttpSys/RequestProcessing/HeaderCollection.cs
index aa1751ed6f..4f6cd220e4 100644
--- a/src/Microsoft.AspNetCore.Server.HttpSys/RequestProcessing/HeaderCollection.cs
+++ b/src/Microsoft.AspNetCore.Server.HttpSys/RequestProcessing/HeaderCollection.cs
@@ -8,7 +8,7 @@ using Microsoft.Extensions.Primitives;
 
 namespace Microsoft.AspNetCore.Server.HttpSys
 {
-    public class HeaderCollection : IDictionary<string, StringValues>
+    internal class HeaderCollection : IDictionary<string, StringValues>
     {
         public HeaderCollection()
             : this(new Dictionary<string, StringValues>(4, StringComparer.OrdinalIgnoreCase))
diff --git a/src/Microsoft.AspNetCore.Server.HttpSys/RequestProcessing/Request.cs b/src/Microsoft.AspNetCore.Server.HttpSys/RequestProcessing/Request.cs
index 605e9597f0..7741232aa6 100644
--- a/src/Microsoft.AspNetCore.Server.HttpSys/RequestProcessing/Request.cs
+++ b/src/Microsoft.AspNetCore.Server.HttpSys/RequestProcessing/Request.cs
@@ -12,7 +12,7 @@ using System.Threading.Tasks;
 
 namespace Microsoft.AspNetCore.Server.HttpSys
 {
-    public sealed class Request
+    internal sealed class Request
     {
         private NativeRequestContext _nativeRequestContext;
 
diff --git a/src/Microsoft.AspNetCore.Server.HttpSys/RequestProcessing/RequestContext.cs b/src/Microsoft.AspNetCore.Server.HttpSys/RequestProcessing/RequestContext.cs
index 259b539a61..6cd4e48d18 100644
--- a/src/Microsoft.AspNetCore.Server.HttpSys/RequestProcessing/RequestContext.cs
+++ b/src/Microsoft.AspNetCore.Server.HttpSys/RequestProcessing/RequestContext.cs
@@ -13,7 +13,7 @@ using Microsoft.Extensions.Logging;
 
 namespace Microsoft.AspNetCore.Server.HttpSys
 {
-    public sealed class RequestContext : IDisposable
+    internal sealed class RequestContext : IDisposable
     {
         private static readonly Action<object> AbortDelegate = Abort;
 
diff --git a/src/Microsoft.AspNetCore.Server.HttpSys/RequestProcessing/Response.cs b/src/Microsoft.AspNetCore.Server.HttpSys/RequestProcessing/Response.cs
index 403525f748..9936d817ee 100644
--- a/src/Microsoft.AspNetCore.Server.HttpSys/RequestProcessing/Response.cs
+++ b/src/Microsoft.AspNetCore.Server.HttpSys/RequestProcessing/Response.cs
@@ -15,7 +15,7 @@ using static Microsoft.AspNetCore.Server.HttpSys.UnsafeNclNativeMethods;
 
 namespace Microsoft.AspNetCore.Server.HttpSys
 {
-    public sealed class Response
+    internal sealed class Response
     {
         private ResponseState _responseState;
         private string _reasonPhrase;