diff --git a/Directory.Build.targets b/Directory.Build.targets
index 331cc769..38d1648d 100644
--- a/Directory.Build.targets
+++ b/Directory.Build.targets
@@ -3,6 +3,10 @@
     <!-- Add default suffix if there is no InternalsVisibleTo or InternalsVisibleToSuffix defined -->
     <ItemGroup Condition="@(InternalsVisibleToSuffix->Count()) == 0 AND @(InternalsVisibleTo->Count()) == 0">
       <InternalsVisibleToSuffix Include=".Tests" />
+
+      <AssemblyAttribute Include="System.Runtime.CompilerServices.InternalsVisibleTo">
+        <_Parameter1>DynamicProxyGenAssembly2</_Parameter1>
+      </AssemblyAttribute>
     </ItemGroup>
 
     <!-- Handle InternalsVisibleTo -->