diff --git a/src/OpenFeature.DependencyInjection/OpenFeature.DependencyInjection.csproj b/src/OpenFeature.DependencyInjection/OpenFeature.DependencyInjection.csproj
index 6f8163fb6..99270ab38 100644
--- a/src/OpenFeature.DependencyInjection/OpenFeature.DependencyInjection.csproj
+++ b/src/OpenFeature.DependencyInjection/OpenFeature.DependencyInjection.csproj
@@ -17,12 +17,8 @@
   </ItemGroup>
 
   <ItemGroup>
-    <AssemblyAttribute Include="System.Runtime.CompilerServices.InternalsVisibleTo">
-      <_Parameter1>$(AssemblyName).Tests</_Parameter1>
-    </AssemblyAttribute>
-    <AssemblyAttribute Include="System.Runtime.CompilerServices.InternalsVisibleTo">
-      <_Parameter1>DynamicProxyGenAssembly2</_Parameter1>
-    </AssemblyAttribute>
+    <InternalsVisibleTo Include="$(AssemblyName).Tests" />
+    <InternalsVisibleTo Include="DynamicProxyGenAssembly2" />
   </ItemGroup>
 
 </Project>
diff --git a/src/OpenFeature/FeatureProvider.cs b/src/OpenFeature/FeatureProvider.cs
index 6aff0129f..b5b9a30f7 100644
--- a/src/OpenFeature/FeatureProvider.cs
+++ b/src/OpenFeature/FeatureProvider.cs
@@ -1,13 +1,10 @@
 using System.Collections.Immutable;
-using System.Runtime.CompilerServices;
 using System.Threading;
 using System.Threading.Channels;
 using System.Threading.Tasks;
 using OpenFeature.Constant;
 using OpenFeature.Model;
 
-[assembly: InternalsVisibleTo("DynamicProxyGenAssembly2")] // required to allow NSubstitute mocking of internal methods
-
 namespace OpenFeature
 {
     /// <summary>
diff --git a/src/OpenFeature/OpenFeature.csproj b/src/OpenFeature/OpenFeature.csproj
index 357d39c5d..c47b109d0 100644
--- a/src/OpenFeature/OpenFeature.csproj
+++ b/src/OpenFeature/OpenFeature.csproj
@@ -12,6 +12,7 @@
   </ItemGroup>
 
   <ItemGroup>
+    <InternalsVisibleTo Include="DynamicProxyGenAssembly2" />
     <InternalsVisibleTo Include="OpenFeature.Benchmarks" />
     <InternalsVisibleTo Include="OpenFeature.Tests" />
     <InternalsVisibleTo Include="OpenFeature.E2ETests" />