diff --git a/src/Microsoft.AspNet.HttpFeature/AssemblyNeutralAttribute.cs b/src/Microsoft.AspNet.HttpFeature/AssemblyNeutralAttribute.cs
new file mode 100644
index 0000000000..1aa358ee9f
--- /dev/null
+++ b/src/Microsoft.AspNet.HttpFeature/AssemblyNeutralAttribute.cs
@@ -0,0 +1,10 @@
+using System;
+
+namespace Microsoft.Net.Runtime
+{
+    [AssemblyNeutralAttribute]
+    [AttributeUsage(AttributeTargets.All, Inherited = false, AllowMultiple = true)]
+    public sealed class AssemblyNeutralAttribute : Attribute
+    {
+    }
+}
\ No newline at end of file
diff --git a/src/Microsoft.AspNet.HttpFeature/IHttpApplicationInformation.cs b/src/Microsoft.AspNet.HttpFeature/IHttpApplicationInformation.cs
index 37dea109ab..92100273e2 100644
--- a/src/Microsoft.AspNet.HttpFeature/IHttpApplicationInformation.cs
+++ b/src/Microsoft.AspNet.HttpFeature/IHttpApplicationInformation.cs
@@ -1,7 +1,9 @@
 using System.Threading;
+using Microsoft.Net.Runtime;
 
 namespace Microsoft.AspNet.HttpFeature
 {
+    [AssemblyNeutral]
     public interface IHttpApplicationInformation
     {
         string AppName { get; set; }
diff --git a/src/Microsoft.AspNet.HttpFeature/IHttpBuffering.cs b/src/Microsoft.AspNet.HttpFeature/IHttpBuffering.cs
index e13fde6988..5a996c4299 100644
--- a/src/Microsoft.AspNet.HttpFeature/IHttpBuffering.cs
+++ b/src/Microsoft.AspNet.HttpFeature/IHttpBuffering.cs
@@ -1,5 +1,8 @@
-namespace Microsoft.AspNet.HttpFeature
+using Microsoft.Net.Runtime;
+
+namespace Microsoft.AspNet.HttpFeature
 {
+    [AssemblyNeutral]
     public interface IHttpBuffering
     {
         void DisableRequestBuffering();
diff --git a/src/Microsoft.AspNet.HttpFeature/IHttpConnection.cs b/src/Microsoft.AspNet.HttpFeature/IHttpConnection.cs
index 3598c015f1..73a76ffbf0 100644
--- a/src/Microsoft.AspNet.HttpFeature/IHttpConnection.cs
+++ b/src/Microsoft.AspNet.HttpFeature/IHttpConnection.cs
@@ -1,7 +1,9 @@
 using System.Net;
+using Microsoft.Net.Runtime;
 
 namespace Microsoft.AspNet.HttpFeature
 {
+    [AssemblyNeutral]
     public interface IHttpConnection
     {
         IPAddress RemoteIpAddress { get; set; }
diff --git a/src/Microsoft.AspNet.HttpFeature/IHttpRequestInformation.cs b/src/Microsoft.AspNet.HttpFeature/IHttpRequestInformation.cs
index a293218830..b223d151e4 100644
--- a/src/Microsoft.AspNet.HttpFeature/IHttpRequestInformation.cs
+++ b/src/Microsoft.AspNet.HttpFeature/IHttpRequestInformation.cs
@@ -1,9 +1,11 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using Microsoft.Net.Runtime;
 
 namespace Microsoft.AspNet.HttpFeature
 {
+    [AssemblyNeutral]
     public interface IHttpRequestInformation
     {
         string Protocol { get; set; }
diff --git a/src/Microsoft.AspNet.HttpFeature/IHttpRequestLifetime.cs b/src/Microsoft.AspNet.HttpFeature/IHttpRequestLifetime.cs
index 3ea7a0ee34..41728c5869 100644
--- a/src/Microsoft.AspNet.HttpFeature/IHttpRequestLifetime.cs
+++ b/src/Microsoft.AspNet.HttpFeature/IHttpRequestLifetime.cs
@@ -1,7 +1,9 @@
 using System.Threading;
+using Microsoft.Net.Runtime;
 
 namespace Microsoft.AspNet.HttpFeature
 {
+    [AssemblyNeutral]
     public interface IHttpRequestLifetime
     {
         CancellationToken OnRequestAborted { get; }
diff --git a/src/Microsoft.AspNet.HttpFeature/IHttpResponseInformation.cs b/src/Microsoft.AspNet.HttpFeature/IHttpResponseInformation.cs
index ce0185c88e..090c0f9107 100644
--- a/src/Microsoft.AspNet.HttpFeature/IHttpResponseInformation.cs
+++ b/src/Microsoft.AspNet.HttpFeature/IHttpResponseInformation.cs
@@ -1,9 +1,11 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using Microsoft.Net.Runtime;
 
 namespace Microsoft.AspNet.HttpFeature
 {
+    [AssemblyNeutral]
     public interface IHttpResponseInformation
     {
         int StatusCode { get; set; }
diff --git a/src/Microsoft.AspNet.HttpFeature/IHttpSendFile.cs b/src/Microsoft.AspNet.HttpFeature/IHttpSendFile.cs
index f64ea29264..faeed5f775 100644
--- a/src/Microsoft.AspNet.HttpFeature/IHttpSendFile.cs
+++ b/src/Microsoft.AspNet.HttpFeature/IHttpSendFile.cs
@@ -1,8 +1,10 @@
 using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.Net.Runtime;
 
 namespace Microsoft.AspNet.HttpFeature
 {
+    [AssemblyNeutral]
     public interface IHttpSendFile
     {
         Task SendFileAsync(string path, long offset, long? length, CancellationToken cancellation);
diff --git a/src/Microsoft.AspNet.HttpFeature/IHttpTransportLayerSecurity.cs b/src/Microsoft.AspNet.HttpFeature/IHttpTransportLayerSecurity.cs
index fd08f2b076..e759aef2b9 100644
--- a/src/Microsoft.AspNet.HttpFeature/IHttpTransportLayerSecurity.cs
+++ b/src/Microsoft.AspNet.HttpFeature/IHttpTransportLayerSecurity.cs
@@ -1,9 +1,10 @@
-
 using System.Security.Cryptography.X509Certificates;
 using System.Threading.Tasks;
+using Microsoft.Net.Runtime;
 
 namespace Microsoft.AspNet.HttpFeature
 {
+    [AssemblyNeutral]
     public interface IHttpTransportLayerSecurity
     {
         X509Certificate ClientCertificate { get; set; }
diff --git a/src/Microsoft.AspNet.HttpFeature/IHttpWebSocketAccept.cs b/src/Microsoft.AspNet.HttpFeature/IHttpWebSocketAccept.cs
index d7b230df24..772dd96f32 100644
--- a/src/Microsoft.AspNet.HttpFeature/IHttpWebSocketAccept.cs
+++ b/src/Microsoft.AspNet.HttpFeature/IHttpWebSocketAccept.cs
@@ -1,9 +1,11 @@
 #if NET45
 using System.Net.WebSockets;
 using System.Threading.Tasks;
+using Microsoft.Net.Runtime;
 
 namespace Microsoft.AspNet.HttpFeature
 {
+    [AssemblyNeutral]
     public interface IHttpWebSocketAccept
     {
         bool IsWebSocketRequest { get; set; }
diff --git a/src/Microsoft.AspNet.HttpFeature/Security/IAuthTypeContext.cs b/src/Microsoft.AspNet.HttpFeature/Security/IAuthTypeContext.cs
index e91797ceca..df9e9b4aca 100644
--- a/src/Microsoft.AspNet.HttpFeature/Security/IAuthTypeContext.cs
+++ b/src/Microsoft.AspNet.HttpFeature/Security/IAuthTypeContext.cs
@@ -1,7 +1,9 @@
 using System.Collections.Generic;
+using Microsoft.Net.Runtime;
 
 namespace Microsoft.AspNet.HttpFeature.Security
 {
+    [AssemblyNeutral]
     public interface IAuthTypeContext
     {
         void Accept(IDictionary<string,object> description);
diff --git a/src/Microsoft.AspNet.HttpFeature/Security/IAuthenticateContext.cs b/src/Microsoft.AspNet.HttpFeature/Security/IAuthenticateContext.cs
index 7f617e08a2..dc26a4eeaf 100644
--- a/src/Microsoft.AspNet.HttpFeature/Security/IAuthenticateContext.cs
+++ b/src/Microsoft.AspNet.HttpFeature/Security/IAuthenticateContext.cs
@@ -1,8 +1,10 @@
 using System.Collections.Generic;
 using System.Security.Claims;
+using Microsoft.Net.Runtime;
 
 namespace Microsoft.AspNet.HttpFeature.Security
 {
+    [AssemblyNeutral]
     public interface IAuthenticateContext
     {
         IList<string> AuthenticationTypes { get; }
diff --git a/src/Microsoft.AspNet.HttpFeature/Security/IAuthenticationHandler.cs b/src/Microsoft.AspNet.HttpFeature/Security/IAuthenticationHandler.cs
index 8a519b5de9..efc3a3b344 100644
--- a/src/Microsoft.AspNet.HttpFeature/Security/IAuthenticationHandler.cs
+++ b/src/Microsoft.AspNet.HttpFeature/Security/IAuthenticationHandler.cs
@@ -1,8 +1,10 @@
 using System.Collections.Generic;
 using System.Threading.Tasks;
+using Microsoft.Net.Runtime;
 
 namespace Microsoft.AspNet.HttpFeature.Security
 {
+    [AssemblyNeutral]
     public interface IAuthenticationHandler
     {
         void GetDescriptions(IAuthTypeContext context);
diff --git a/src/Microsoft.AspNet.HttpFeature/Security/IChallengeContext.cs b/src/Microsoft.AspNet.HttpFeature/Security/IChallengeContext.cs
index 2707c6c63d..d684fe7542 100644
--- a/src/Microsoft.AspNet.HttpFeature/Security/IChallengeContext.cs
+++ b/src/Microsoft.AspNet.HttpFeature/Security/IChallengeContext.cs
@@ -1,7 +1,9 @@
 using System.Collections.Generic;
+using Microsoft.Net.Runtime;
 
 namespace Microsoft.AspNet.HttpFeature.Security
 {
+    [AssemblyNeutral]
     public interface IChallengeContext
     {
         IList<string> AuthenticationTypes {get;}
diff --git a/src/Microsoft.AspNet.HttpFeature/Security/IHttpAuthentication.cs b/src/Microsoft.AspNet.HttpFeature/Security/IHttpAuthentication.cs
index d1a7c16596..0d24c184f7 100644
--- a/src/Microsoft.AspNet.HttpFeature/Security/IHttpAuthentication.cs
+++ b/src/Microsoft.AspNet.HttpFeature/Security/IHttpAuthentication.cs
@@ -1,7 +1,9 @@
 using System.Security.Claims;
+using Microsoft.Net.Runtime;
 
 namespace Microsoft.AspNet.HttpFeature.Security
 {
+    [AssemblyNeutral]
     public interface IHttpAuthentication
     {
         ClaimsPrincipal User { get; set; }
diff --git a/src/Microsoft.AspNet.HttpFeature/Security/ISignInContext.cs b/src/Microsoft.AspNet.HttpFeature/Security/ISignInContext.cs
index cb78f661b2..0a57985f62 100644
--- a/src/Microsoft.AspNet.HttpFeature/Security/ISignInContext.cs
+++ b/src/Microsoft.AspNet.HttpFeature/Security/ISignInContext.cs
@@ -1,8 +1,10 @@
 using System.Collections.Generic;
 using System.Security.Claims;
+using Microsoft.Net.Runtime;
 
 namespace Microsoft.AspNet.HttpFeature.Security
 {
+    [AssemblyNeutral]
     public interface ISignInContext
     {
         IList<ClaimsIdentity> Identities { get; }
diff --git a/src/Microsoft.AspNet.HttpFeature/Security/ISignOutContext .cs b/src/Microsoft.AspNet.HttpFeature/Security/ISignOutContext .cs
index 9a1232ff3a..6a27a9e5ea 100644
--- a/src/Microsoft.AspNet.HttpFeature/Security/ISignOutContext .cs	
+++ b/src/Microsoft.AspNet.HttpFeature/Security/ISignOutContext .cs	
@@ -1,7 +1,9 @@
 using System.Collections.Generic;
+using Microsoft.Net.Runtime;
 
 namespace Microsoft.AspNet.HttpFeature.Security
 {
+    [AssemblyNeutral]
     public interface ISignOutContext 
     {
         IList<string> AuthenticationTypes { get; }