diff --git a/src/Microsoft.AspNet.TestHost/project.json b/src/Microsoft.AspNet.TestHost/project.json
index c32b8f617b..b6fc16fd22 100644
--- a/src/Microsoft.AspNet.TestHost/project.json
+++ b/src/Microsoft.AspNet.TestHost/project.json
@@ -3,7 +3,7 @@
     "description": "ASP.NET 5 web server for writing and running tests.",
     "dependencies": {
         "Microsoft.AspNet.Hosting": "1.0.0-*",
-        "Microsoft.Framework.NotNullAttribute.Internal": { "version": "1.0.0-*", "type": "build" }
+        "Microsoft.Framework.NotNullAttribute.Sources": { "version": "1.0.0-*", "type": "build" }
     },
     "frameworks": {
         "dnx451": {