diff --git a/2-modular-monolith-architecture-style/src/Modules/Flight/src/Flight.csproj b/2-modular-monolith-architecture-style/src/Modules/Flight/src/Flight.csproj
index 32de653..3fd1c13 100644
--- a/2-modular-monolith-architecture-style/src/Modules/Flight/src/Flight.csproj
+++ b/2-modular-monolith-architecture-style/src/Modules/Flight/src/Flight.csproj
@@ -31,6 +31,11 @@
         <_Parameter1>Integration.Test</_Parameter1>
       </AssemblyAttribute>
   </ItemGroup>
+  <ItemGroup>
+      <AssemblyAttribute Include="System.Runtime.CompilerServices.InternalsVisibleTo">
+        <_Parameter1>EndToEnd.Test</_Parameter1>
+      </AssemblyAttribute>
+  </ItemGroup>
 
   <ItemGroup>
     <ProjectReference Include="..\..\..\..\..\building-blocks\BuildingBlocks.csproj" />