diff --git a/src/Microsoft.AspNet.Hosting.Interfaces/project.json b/src/Microsoft.AspNet.Hosting.Interfaces/project.json
index 6f33dd5cea..bb1e04e39b 100644
--- a/src/Microsoft.AspNet.Hosting.Interfaces/project.json
+++ b/src/Microsoft.AspNet.Hosting.Interfaces/project.json
@@ -7,7 +7,7 @@
         "Microsoft.Framework.ConfigurationModel": "1.0.0-*"
     },
     "frameworks": {
-        "aspnet50": {},
-        "aspnetcore50": {}
+        "dnx451": {},
+        "dnxcore50": {}
     }
-}
\ No newline at end of file
+}
diff --git a/src/Microsoft.AspNet.Hosting/HttpContextAccessor.cs b/src/Microsoft.AspNet.Hosting/HttpContextAccessor.cs
index 59b5cbd8fa..5b1e0ef9e1 100644
--- a/src/Microsoft.AspNet.Hosting/HttpContextAccessor.cs
+++ b/src/Microsoft.AspNet.Hosting/HttpContextAccessor.cs
@@ -1,11 +1,11 @@
-// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-#if ASPNET50
+#if DNX451
 using System.Runtime.Remoting.Messaging;
 using System.Runtime.Remoting;
-#elif ASPNETCORE50
+#elif DNXCORE50
 using System.Threading;
 #endif
 using Microsoft.AspNet.Http;
@@ -14,7 +14,7 @@ namespace Microsoft.AspNet.Hosting
 {
     public class HttpContextAccessor : IHttpContextAccessor
     {
-#if ASPNET50
+#if DNX451
         private const string LogicalDataKey = "__HttpContext_Current__";
 
         public HttpContext HttpContext
@@ -30,7 +30,7 @@ namespace Microsoft.AspNet.Hosting
             }
         }
 
-#elif ASPNETCORE50
+#elif DNXCORE50
         private AsyncLocal<HttpContext> _httpContextCurrent = new AsyncLocal<HttpContext>();
         public HttpContext HttpContext
         {
diff --git a/src/Microsoft.AspNet.Hosting/project.json b/src/Microsoft.AspNet.Hosting/project.json
index f4deb14aca..03a441eba0 100644
--- a/src/Microsoft.AspNet.Hosting/project.json
+++ b/src/Microsoft.AspNet.Hosting/project.json
@@ -1,4 +1,4 @@
-{
+{
     "version": "1.0.0-*",
     "description": "ASP.NET 5 core hosting infrastructure and startup logic for web applications.",
     "dependencies": {
@@ -11,8 +11,8 @@
         "Newtonsoft.Json": "6.0.6"
     },
     "frameworks": {
-        "aspnet50": { },
-        "aspnetcore50": {
+        "dnx451": { },
+        "dnxcore50": {
             "dependencies": {
                 "System.Console": "4.0.0-beta-*"
             }
diff --git a/src/Microsoft.AspNet.RequestContainer/project.json b/src/Microsoft.AspNet.RequestContainer/project.json
index 076064ad98..b2729bd744 100644
--- a/src/Microsoft.AspNet.RequestContainer/project.json
+++ b/src/Microsoft.AspNet.RequestContainer/project.json
@@ -1,4 +1,4 @@
-{
+{
   "version": "1.0.0-*",
   "description": "ASP.NET 5 enables per-request scoping of services.",
   "dependencies": {
@@ -7,8 +7,8 @@
     "Microsoft.Framework.OptionsModel": "1.0.0-*"
   },
   "frameworks": {
-    "aspnet50": {},
-    "aspnetcore50": {
+    "dnx451": {},
+    "dnxcore50": {
       "dependencies": {
         "System.Threading": "4.0.10-beta-*"
       }
diff --git a/src/Microsoft.AspNet.TestHost/ResponseStream.cs b/src/Microsoft.AspNet.TestHost/ResponseStream.cs
index 64e64c0c64..a3b555bd70 100644
--- a/src/Microsoft.AspNet.TestHost/ResponseStream.cs
+++ b/src/Microsoft.AspNet.TestHost/ResponseStream.cs
@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
@@ -161,7 +161,7 @@ namespace Microsoft.AspNet.TestHost
                 _readLock.Release();
             }
         }
-#if ASPNET50
+#if DNX451
         public override IAsyncResult BeginRead(byte[] buffer, int offset, int count, AsyncCallback callback, object state)
         {
             // TODO: This option doesn't preserve the state object.
@@ -258,7 +258,7 @@ namespace Microsoft.AspNet.TestHost
                 _writeLock.Release();
             }
         }
-#if ASPNET50
+#if DNX451
         public override IAsyncResult BeginWrite(byte[] buffer, int offset, int count, AsyncCallback callback, object state)
         {
             Write(buffer, offset, count);
diff --git a/src/Microsoft.AspNet.TestHost/project.json b/src/Microsoft.AspNet.TestHost/project.json
index c63c7dba59..c6360f74da 100644
--- a/src/Microsoft.AspNet.TestHost/project.json
+++ b/src/Microsoft.AspNet.TestHost/project.json
@@ -1,16 +1,16 @@
-{
+{
     "version": "1.0.0-*",
     "description": "ASP.NET 5 web server for writing and running tests.",
     "dependencies": {
         "Microsoft.AspNet.Hosting": "1.0.0-*"
     },
     "frameworks": {
-        "aspnet50": {
+        "dnx451": {
             "frameworkAssemblies": {
                 "System.Net.Http": ""
             }
         },
-        "aspnetcore50": {
+        "dnxcore50": {
             "dependencies": {
                 "System.Diagnostics.Contracts": "4.0.0-beta-*",
                 "System.Net.Http": "4.0.0-beta-*"
diff --git a/test/Microsoft.AspNet.Hosting.Tests/project.json b/test/Microsoft.AspNet.Hosting.Tests/project.json
index 49c5506d3a..22e492d189 100644
--- a/test/Microsoft.AspNet.Hosting.Tests/project.json
+++ b/test/Microsoft.AspNet.Hosting.Tests/project.json
@@ -1,4 +1,4 @@
-{
+{
     "dependencies": {
         "Microsoft.AspNet.Hosting": "1.0.0-*",
         "Microsoft.AspNet.Owin": "1.0.0-*",
@@ -6,10 +6,10 @@
         "xunit.runner.kre": "1.0.0-*"
     },
     "frameworks": {
-        "aspnet50": {}
+        "dnx451": {}
     },
     "commands": {
         "test": "xunit.runner.kre"
     },
     "webroot": "testroot"
-}
\ No newline at end of file
+}
diff --git a/test/Microsoft.AspNet.TestHost.Tests/project.json b/test/Microsoft.AspNet.TestHost.Tests/project.json
index cf98630c3f..df5be3e395 100644
--- a/test/Microsoft.AspNet.TestHost.Tests/project.json
+++ b/test/Microsoft.AspNet.TestHost.Tests/project.json
@@ -1,4 +1,4 @@
-{
+{
     "dependencies": {
         "Microsoft.AspNet.TestHost": "1.0.0-*",
         "xunit.runner.kre": "1.0.0-*"
@@ -7,6 +7,6 @@
         "test": "xunit.runner.kre"
     },
     "frameworks": {
-        "aspnet50": { }
+        "dnx451": { }
     }
 }