diff --git a/src/Generator/Generators/CSharp/CSharpTextTemplate.cs b/src/Generator/Generators/CSharp/CSharpTextTemplate.cs
index 9f0eaffe..003f5078 100644
--- a/src/Generator/Generators/CSharp/CSharpTextTemplate.cs
+++ b/src/Generator/Generators/CSharp/CSharpTextTemplate.cs
@@ -646,6 +646,8 @@ namespace CppSharp.Generators.CSharp
         public void GenerateClassProlog(Class @class)
         {
             Write(@class.IsInternal ? "internal " : Helpers.GetAccess(@class.Access));
+            if (@class.Access == AccessSpecifier.Protected)
+                Write("internal ");
             Write("unsafe ");
 
             if (Driver.Options.GenerateAbstractImpls && @class.IsAbstract)
diff --git a/tests/CSharpTemp/CSharpTemp.h b/tests/CSharpTemp/CSharpTemp.h
index 4763b28a..27a52619 100644
--- a/tests/CSharpTemp/CSharpTemp.h
+++ b/tests/CSharpTemp/CSharpTemp.h
@@ -468,3 +468,13 @@ private:
     HasVirtualDtor2* hasVirtualDtor2;
     Bar* bar;
 };
+
+class HasProtectedNestedAnonymousType
+{
+protected:
+    union
+    {
+        int i;
+        double d;
+    } u;
+};