diff --git a/samples/StaticFileSample/project.json b/samples/StaticFileSample/project.json
index 47d2733df8..9948338281 100644
--- a/samples/StaticFileSample/project.json
+++ b/samples/StaticFileSample/project.json
@@ -1,4 +1,4 @@
-{
+{
     "commands": {
         "web": "Microsoft.AspNet.Hosting --server Microsoft.AspNet.Server.WebListener --server.Urls http://localhost:12345/"
     },
@@ -11,8 +11,8 @@
         "Microsoft.Framework.Logging.Console": "1.0.0-*"
     },
     "frameworks": {
-        "aspnet50": {},
-        "aspnetcore50": {}
+        "dnx451": {},
+        "dnxcore50": {}
     },
     "webroot": "wwwroot"
-}
\ No newline at end of file
+}
diff --git a/src/Microsoft.AspNet.StaticFiles/SendFileMiddleware.cs b/src/Microsoft.AspNet.StaticFiles/SendFileMiddleware.cs
index b9be2cc7da..5b1d1dfe91 100644
--- a/src/Microsoft.AspNet.StaticFiles/SendFileMiddleware.cs
+++ b/src/Microsoft.AspNet.StaticFiles/SendFileMiddleware.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;
@@ -81,7 +81,7 @@ namespace Microsoft.AspNet.StaticFiles
                     throw new ArgumentOutOfRangeException("length", length, string.Empty);
                 }
 
-#if ASPNET50
+#if DNX451
                 Stream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, 1024 * 64,
                     FileOptions.Asynchronous | FileOptions.SequentialScan);
 #else
diff --git a/src/Microsoft.AspNet.StaticFiles/project.json b/src/Microsoft.AspNet.StaticFiles/project.json
index d7b842b92c..0090bb41b4 100644
--- a/src/Microsoft.AspNet.StaticFiles/project.json
+++ b/src/Microsoft.AspNet.StaticFiles/project.json
@@ -1,4 +1,4 @@
-{
+{
     "version": "1.0.0-*",
     "description": "ASP.NET 5 static files middleware.",
     "dependencies": {
@@ -10,7 +10,7 @@
         "Microsoft.Framework.WebEncoders": "1.0.0-*"
     },
     "frameworks": {
-        "aspnet50": { },
-        "aspnetcore50": { }
+        "dnx451": { },
+        "dnxcore50": { }
     }
 }
diff --git a/test/Microsoft.AspNet.StaticFiles.Tests/project.json b/test/Microsoft.AspNet.StaticFiles.Tests/project.json
index e091d742bb..5e63d5e3ab 100644
--- a/test/Microsoft.AspNet.StaticFiles.Tests/project.json
+++ b/test/Microsoft.AspNet.StaticFiles.Tests/project.json
@@ -1,4 +1,4 @@
-{
+{
     "dependencies": {
         "Microsoft.AspNet.Http.Core": "1.0.0-*",
         "Microsoft.AspNet.RequestContainer": "1.0.0-*",
@@ -11,10 +11,10 @@
         "test": "xunit.runner.kre"
     },
     "frameworks": {
-        "aspnet50": {
+        "dnx451": {
             "dependencies": {
                 "Shouldly": "1.1.1.1"
             }
         }
     }
-}
\ No newline at end of file
+}