diff --git a/src/Generator.Tests/Passes/TestPasses.cs b/src/Generator.Tests/Passes/TestPasses.cs
index 58533f0e..856767b5 100644
--- a/src/Generator.Tests/Passes/TestPasses.cs
+++ b/src/Generator.Tests/Passes/TestPasses.cs
@@ -232,5 +232,23 @@ namespace CppSharp.Generator.Tests.Passes
             var @class = AstContext.FindDecl<Class>("ClassWithAbstractOperator").First();
             Assert.AreEqual(@class.Operators.First().GenerationKind, GenerationKind.None);
         }
+
+        [Test]
+        public void TestFlattenAnonymousTypesToFields()
+        {
+            passBuilder.AddPass(new FlattenAnonymousTypesToFields());
+            passBuilder.RunPasses(pass => pass.VisitASTContext(AstContext));
+
+            var @class = AstContext.FindDecl<Class>("TestFlattenAnonymousTypesToFields").First();
+
+            /* TODO: Enable this test and fix the parsing bug
+            var @public = @class.Fields.Where(f => f.Name == "Public").FirstOrDefault();
+            Assert.IsNotNull(@public);
+            Assert.AreEqual(AccessSpecifier.Public, @public.Access); */
+
+            var @protected = @class.Fields.Where(f => f.Name == "Protected").FirstOrDefault();
+            Assert.IsNotNull(@protected);
+            Assert.AreEqual(AccessSpecifier.Protected, @protected.Access);
+        }
     }
 }
diff --git a/src/Generator/Passes/FlattenAnonymousTypesToFields.cs b/src/Generator/Passes/FlattenAnonymousTypesToFields.cs
index 964cb710..b8fa0b01 100644
--- a/src/Generator/Passes/FlattenAnonymousTypesToFields.cs
+++ b/src/Generator/Passes/FlattenAnonymousTypesToFields.cs
@@ -75,6 +75,7 @@ namespace CppSharp.Passes
             {
                 Field nestedField = fieldType.Fields[j];
                 nestedField.Namespace = @class;
+                nestedField.Access = fieldType.Access;
                 @class.Fields.Insert(i + j, nestedField);
             }
         }
diff --git a/tests/Native/Passes.h b/tests/Native/Passes.h
index 79ab7ab3..40d794c3 100644
--- a/tests/Native/Passes.h
+++ b/tests/Native/Passes.h
@@ -84,3 +84,19 @@ enum ConnectionRole
 };
 
 bool ConnectionRoleToString(const ConnectionRole& role, const char* role_str);
+
+class TestFlattenAnonymousTypesToFields
+{
+/* TODO: Enable this code (and respective test in TestPasses).
+public:
+    union
+    {
+        int Public;
+    };
+*/
+protected:
+    union
+    {
+        int Protected;
+    };
+};