diff --git a/tools/qmltc/prototype/qml2cppdefaultpasses.cpp b/tools/qmltc/prototype/qml2cppdefaultpasses.cpp
index 13ce81202c..870f94359a 100644
--- a/tools/qmltc/prototype/qml2cppdefaultpasses.cpp
+++ b/tools/qmltc/prototype/qml2cppdefaultpasses.cpp
@@ -506,23 +506,16 @@ QHash<QString, qsizetype> makeUniqueCppNames(const Qml2CppContext &context,
     QHash<QString, qsizetype> typeCounts;
     for (const QString &str : cppKeywords)
         typeCounts.insert(str, 1);
-    const auto knownCppNames = context.typeResolver->gatherKnownCppClassNames();
-    for (const QString &str : knownCppNames)
-        typeCounts.insert(str, 1);
 
     // root is special:
     QQmlJSScope::Ptr root = context.typeResolver->root();
     QFileInfo fi(context.documentUrl);
     auto cppName = fi.baseName();
-    // TODO: root is special and with implicit import directory cppName might be
-    // in typeCounts.
-#if 0
     if (typeCounts.contains(cppName)) {
         context.recordError(root->sourceLocation(),
                             u"Root object name '" + cppName + u"' is reserved");
         return typeCounts;
     }
-#endif
     if (cppName.isEmpty()) {
         context.recordError(root->sourceLocation(), u"Root object's name is empty"_qs);
         return typeCounts;
diff --git a/tools/qmltc/prototype/typeresolver.h b/tools/qmltc/prototype/typeresolver.h
index fc8e1c70eb..a382c4c07a 100644
--- a/tools/qmltc/prototype/typeresolver.h
+++ b/tools/qmltc/prototype/typeresolver.h
@@ -42,30 +42,6 @@ class TypeResolver : public QQmlJSTypeResolver
 public:
     TypeResolver(QQmlJSImporter *importer);
 
-    // helper function for code generator
-    QStringList gatherKnownCppClassNames() const
-    {
-        QStringList cppNames;
-        QQmlJSImporter::ImportedTypes builtins = m_importer->builtinInternalNames();
-        cppNames.reserve(builtins.size() + m_imports.size());
-        const auto getInternalName = [](const QQmlJSImportedScope &t) {
-            if (!t.scope)
-                return QString();
-            return t.scope->internalName();
-        };
-        std::transform(builtins.cbegin(), builtins.cend(), std::back_inserter(cppNames),
-                       getInternalName);
-
-        // builtins must be valid: all QQmlJSScopes are not nullptr and have
-        // non-empty internal names. m_imports may have nullptrs, due to import
-        // namespaces
-        Q_ASSERT(std::find(cppNames.cbegin(), cppNames.cend(), QString()) == cppNames.cend());
-
-        std::transform(m_imports.cbegin(), m_imports.cend(), std::back_inserter(cppNames),
-                       getInternalName);
-        return cppNames;
-    }
-
     void init(Visitor &visitor, QQmlJS::AST::Node *program);
 
     // TODO: this shouldn't be exposed. instead, all the custom passes on