diff --git a/src/OpenTK/Properties/AssemblyInfo.cs b/src/OpenTK/Properties/AssemblyInfo.cs
index f0d6b897..5246aeff 100644
--- a/src/OpenTK/Properties/AssemblyInfo.cs
+++ b/src/OpenTK/Properties/AssemblyInfo.cs
@@ -1,6 +1,7 @@
 // <auto-generated/>
 using System;
 using System.Reflection;
+using System.Runtime.CompilerServices;
 
 [assembly: AssemblyTitleAttribute("OpenTK")]
 [assembly: AssemblyProductAttribute("OpenTK")]
@@ -9,6 +10,9 @@ using System.Reflection;
 [assembly: AssemblyFileVersionAttribute("3.0.0")]
 [assembly: CLSCompliantAttribute(true)]
 [assembly: AssemblyCopyrightAttribute("Copyright (c) 2006 - 2016 Stefanos Apostolopoulos <stapostol@gmail.com> for the Open Toolkit library.")]
+
+[assembly: InternalsVisibleTo("OpenTK.GLWidget, PublicKey=0024000004800000940000000602000000240000525341310004000011000000a3e05aafb87f71fb8fd02b512707f289c12341de98c6ce2ec1494b71c20cb2032cbd65d091b447df3ec772257efb9fa3591201937890e067da1d29a339948a12b29c2847a787cc9fbef2a3bf78267026e85f36aab827228df4bb580e3ae0599ade036f0a97a0e6982f5406d98d114455f332350f6d8369db655e9c3e7976c2c8")]
+
 namespace System {
     internal static class AssemblyVersionInformation {
         internal const System.String AssemblyTitle = "OpenTK";