diff --git a/TMDbLib/Properties/AssemblyInfo.cs b/TMDbLib/Properties/AssemblyInfo.cs
index a21053b..3af0824 100644
--- a/TMDbLib/Properties/AssemblyInfo.cs
+++ b/TMDbLib/Properties/AssemblyInfo.cs
@@ -1,4 +1,5 @@
 using System.Reflection;
+using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
 // General Information about an assembly is controlled through the following 
@@ -12,4 +13,6 @@ using System.Runtime.InteropServices;
 [assembly: ComVisible(false)]
 
 // The following GUID is for the ID of the typelib if this project is exposed to COM
-[assembly: Guid("c8cd805d-f17a-4919-9adb-b5f50d72f32a")]
\ No newline at end of file
+[assembly: Guid("c8cd805d-f17a-4919-9adb-b5f50d72f32a")]
+
+[assembly: InternalsVisibleTo("TMDbLibTests")]
\ No newline at end of file