diff --git a/include/orm/databasemanager.hpp b/include/orm/databasemanager.hpp
index f252ef27e..dcb0dc83d 100644
--- a/include/orm/databasemanager.hpp
+++ b/include/orm/databasemanager.hpp
@@ -397,7 +397,9 @@ namespace Query
         static void checkInstance();
 
         /*! Call QMetaType's register functions needed by the Qt 5. */
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
         static void registerQMetaTypesForQt5();
+#endif
 
         /*! Database configuration. */
         Configuration m_configuration {};
diff --git a/src/orm/databasemanager.cpp b/src/orm/databasemanager.cpp
index e2c5fffd4..baaec21c2 100644
--- a/src/orm/databasemanager.cpp
+++ b/src/orm/databasemanager.cpp
@@ -960,6 +960,7 @@ void DatabaseManager::checkInstance()
             "Only one instance of DatabaseManager is allowed per process.");
 }
 
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
 void DatabaseManager::registerQMetaTypesForQt5()
 {
     if (!QMetaType::hasRegisteredComparators<QtTimeZoneConfig>())
@@ -982,6 +983,7 @@ void DatabaseManager::registerQMetaTypesForQt5()
         QMetaType::registerEqualsComparator<QVector<QVector<AttributeItem>>>();
 #endif
 }
+#endif
 
 } // namespace Orm