diff --git a/aidl_unittest.cpp b/aidl_unittest.cpp
index a7de571..f296ce7 100644
--- a/aidl_unittest.cpp
+++ b/aidl_unittest.cpp
@@ -1474,6 +1474,40 @@
   EXPECT_EQ("::p::IOuter::Inner", cpp::CppNameOf(nested_type, typenames_));
 }
 
+TEST_F(AidlTest, DefinedTypeKnowsItsParentScope) {
+  const string input_path = "p/IFoo.aidl";
+  const string input =
+      "package p;\n"
+      "interface IFoo {\n"
+      "  parcelable Inner {\n"
+      "    enum Enum { A }\n"
+      "  }\n"
+      "}";
+  CaptureStderr();
+  EXPECT_NE(nullptr, Parse(input_path, input, typenames_, Options::Language::CPP));
+  EXPECT_EQ(GetCapturedStderr(), "");
+
+  auto enum_type = typenames_.ResolveTypename("p.IFoo.Inner.Enum");
+  auto inner_type = typenames_.ResolveTypename("p.IFoo.Inner");
+  auto ifoo_type = typenames_.ResolveTypename("p.IFoo");
+  EXPECT_TRUE(enum_type.is_resolved);
+  EXPECT_TRUE(inner_type.is_resolved);
+  EXPECT_TRUE(ifoo_type.is_resolved);
+  // GetParentType()
+  EXPECT_EQ(inner_type.defined_type, enum_type.defined_type->GetParentType());
+  EXPECT_EQ(ifoo_type.defined_type, inner_type.defined_type->GetParentType());
+  EXPECT_EQ(nullptr, ifoo_type.defined_type->GetParentType());
+  // GetRootType()
+  EXPECT_EQ(ifoo_type.defined_type, enum_type.defined_type->GetRootType());
+  EXPECT_EQ(ifoo_type.defined_type, inner_type.defined_type->GetRootType());
+  EXPECT_EQ(ifoo_type.defined_type, ifoo_type.defined_type->GetRootType());
+  // GetDocument()
+  auto main_document = &typenames_.MainDocument();
+  EXPECT_EQ(main_document, &enum_type.defined_type->GetDocument());
+  EXPECT_EQ(main_document, &inner_type.defined_type->GetDocument());
+  EXPECT_EQ(main_document, &ifoo_type.defined_type->GetDocument());
+}
+
 TEST_F(AidlTest, UnderstandsNestedTypesViaFullyQualifiedName) {
   io_delegate_.SetFileContents("p/IOuter.aidl",
                                "package p;\n"