diff --git a/X10D/src/Assembly.cs b/X10D/src/Assembly.cs
index f547610..a2c26c1 100644
--- a/X10D/src/Assembly.cs
+++ b/X10D/src/Assembly.cs
@@ -1 +1,4 @@
-[assembly: CLSCompliant(true)]
+using System.Runtime.CompilerServices;
+
+[assembly: CLSCompliant(true)]
+[assembly: InternalsVisibleTo("X10D.Tests")]