diff --git a/include/FramelessHelper/Core/private/registrykey_p.h b/include/FramelessHelper/Core/private/registrykey_p.h
index dd2a845..72ade24 100644
--- a/include/FramelessHelper/Core/private/registrykey_p.h
+++ b/include/FramelessHelper/Core/private/registrykey_p.h
@@ -83,9 +83,9 @@ private:
     Global::RegistryRootKey m_rootKey = Global::RegistryRootKey::CurrentUser;
     QString m_subKey = {};
 #if REGISTRYKEY_QWINREGISTRYKEY
-    std::unique_ptr<QWinRegistryKey> m_registryKey = nullptr;
+    QScopedPointer<QWinRegistryKey> m_registryKey;
 #else
-    std::unique_ptr<QSettings> m_settings = nullptr;
+    QScopedPointer<QSettings> m_settings;
 #endif
 };
 
diff --git a/src/core/registrykey.cpp b/src/core/registrykey.cpp
index 25645b3..21cb472 100644
--- a/src/core/registrykey.cpp
+++ b/src/core/registrykey.cpp
@@ -85,17 +85,16 @@ RegistryKey::RegistryKey(const RegistryRootKey root, const QString &key, QObject
     m_rootKey = root;
     m_subKey = key;
 #if REGISTRYKEY_QWINREGISTRYKEY
-    m_registryKey = std::make_unique<QWinRegistryKey>(g_keyMap[static_cast<int>(m_rootKey)], m_subKey);
+    m_registryKey.reset(new QWinRegistryKey(g_keyMap[static_cast<int>(m_rootKey)], m_subKey));
     if (!m_registryKey->isValid()) {
         m_registryKey.reset();
     }
 #else
     const QString rootKey = g_strMap[static_cast<int>(m_rootKey)];
     const auto lastSlashPos = m_subKey.lastIndexOf(u'\\');
-    m_settings = std::make_unique<QSettings>(rootKey + u'\\' + m_subKey.left(lastSlashPos), QSettings::NativeFormat);
+    m_settings.reset(new QSettings(rootKey + u'\\' + m_subKey.left(lastSlashPos), QSettings::NativeFormat));
     if (m_settings->childGroups().contains(m_subKey.mid(lastSlashPos + 1))) {
-        m_settings.reset();
-        m_settings = std::make_unique<QSettings>(rootKey + u'\\' + m_subKey, QSettings::NativeFormat);
+        m_settings.reset(new QSettings(rootKey + u'\\' + m_subKey, QSettings::NativeFormat));
     } else {
         m_settings.reset();
     }
@@ -117,9 +116,9 @@ QString RegistryKey::subKey() const
 bool RegistryKey::isValid() const
 {
 #if REGISTRYKEY_QWINREGISTRYKEY
-    return (m_registryKey && m_registryKey->isValid());
+    return (!m_registryKey.isNull() && m_registryKey->isValid());
 #else
-    return m_settings;
+    return !m_settings.isNull();
 #endif
 }