diff --git a/src/Microsoft.AspNet.Session/project.json b/src/Microsoft.AspNet.Session/project.json
index e62bd1d1ba..2eb6c5f09a 100644
--- a/src/Microsoft.AspNet.Session/project.json
+++ b/src/Microsoft.AspNet.Session/project.json
@@ -5,7 +5,7 @@
         "Microsoft.AspNet.Http.Extensions": "1.0.0-*",
         "Microsoft.Framework.Caching.Distributed": "1.0.0-*",
         "Microsoft.Framework.Logging.Abstractions": "1.0.0-*",
-        "Microsoft.Framework.NotNullAttribute.Internal": { "type": "build", "version": "1.0.0-*" }
+        "Microsoft.Framework.NotNullAttribute.Sources": { "type": "build", "version": "1.0.0-*" }
     },
     "compilationOptions": {
         "allowUnsafe": true