diff --git a/default.ps1 b/default.ps1
index 905210c6..c9f2b6cd 100644
--- a/default.ps1
+++ b/default.ps1
@@ -30,7 +30,8 @@ task Init -depends Clean {
 		-company "Hibernating Rhinos" `
 		-product "Rhino Mocks $version" `
 		-version $version `
-		-copyright "Hibernating Rhinos & Ayende Rahien 2004 - 2009"
+		-copyright "Hibernating Rhinos & Ayende Rahien 2004 - 2009" `
+		-internalsVisibleTo "Rhino.Mocks.Tests, PublicKey=00240000048000009400000006020000002400005253413100040000010001009d1cf4b75b7218b141ac64c15450141b1e5f41f6a302ac717ab9761fa6ae2c3ee0c354c22d0a60ac59de41fa285d572e7cf33c320aa7ff877e2b7da1792fcc6aa4eb0b4d8294a2f74cb14d03fb9b091f751d6dc49e626d74601692c99eab7718ed76a40c36d39af842be378b677e6e4eae973f643d7065241ad86ecc156d81ab"
 		
 	Generate-Assembly-Info `
 		-file "$base_dir\Rhino.Mocks.Tests\Properties\AssemblyInfo.cs" `
diff --git a/psake_ext.ps1 b/psake_ext.ps1
index f4b3da93..4ab77468 100644
--- a/psake_ext.ps1
+++ b/psake_ext.ps1
@@ -14,7 +14,8 @@ param(
 	[string]$product, 
 	[string]$copyright, 
 	[string]$version,
-	[string]$file = $(throw "file is a required parameter.")
+	[string]$file = $(throw "file is a required parameter."),
+	[string]$internalsVisibleTo
 )
   $commit = Get-Git-Commit
   $asmInfo = "using System;
@@ -33,6 +34,7 @@ using System.Runtime.InteropServices;
 [assembly: AssemblyInformationalVersionAttribute(""$version / $commit"")]
 [assembly: AssemblyFileVersionAttribute(""$version"")]
 [assembly: AssemblyDelaySignAttribute(false)]
+[assembly: InternalsVisibleTo(""$internalsVisibleTo"")]
 "
 
 	$dir = [System.IO.Path]::GetDirectoryName($file)