diff --git a/samples/ErrorPageSample/project.json b/samples/ErrorPageSample/project.json
index f7f3c958ca..29a4252a0c 100644
--- a/samples/ErrorPageSample/project.json
+++ b/samples/ErrorPageSample/project.json
@@ -19,8 +19,6 @@
         "System.Diagnostics.Tools": "4.0.0.0",
         "System.Globalization": "4.0.10.0",
         "System.IO": "4.0.0.0",
-        "System.IO.FileSystem": "4.0.0.0",
-        "System.IO.FileSystem.Primitives": "4.0.0.0",
         "System.Linq": "4.0.0.0",
         "System.Reflection": "4.0.10.0",
         "System.Resources.ResourceManager": "4.0.0.0",
diff --git a/samples/WelcomePageSample/project.json b/samples/WelcomePageSample/project.json
index be23811ac0..577dcf8834 100644
--- a/samples/WelcomePageSample/project.json
+++ b/samples/WelcomePageSample/project.json
@@ -19,8 +19,6 @@
         "System.Diagnostics.Tools": "4.0.0.0",
         "System.Globalization": "4.0.10.0",
         "System.IO": "4.0.0.0",
-        "System.IO.FileSystem": "4.0.0.0",
-        "System.IO.FileSystem.Primitives": "4.0.0.0",
         "System.Linq": "4.0.0.0",
         "System.Reflection": "4.0.10.0",
         "System.Resources.ResourceManager": "4.0.0.0",
diff --git a/src/Microsoft.AspNet.Diagnostics/project.json b/src/Microsoft.AspNet.Diagnostics/project.json
index 0f3037642e..46cef35da9 100644
--- a/src/Microsoft.AspNet.Diagnostics/project.json
+++ b/src/Microsoft.AspNet.Diagnostics/project.json
@@ -16,6 +16,7 @@
         "System.Diagnostics.Tools": "4.0.0.0",
         "System.Globalization": "4.0.10.0",
         "System.IO": "4.0.0.0",
+        "System.IO.FileSystem": "4.0.10.0",
         "System.Linq": "4.0.0.0",
         "System.Reflection": "4.0.10.0",
         "System.Resources.ResourceManager": "4.0.0.0",