Having a call to QMetaType::fromType in struct QMetaTypeId causes issues if Q_DECLARE_TYPEINFO is used later, as it will already cause an instantiation of QTypeInfo. Instead, use QtPrivate::typenameHelper to obtain the name. We cannot use QMetaTypeForType::getName, as that would cause similarissues with QMetaTypeId2. However, QMetaTypeId2 is only used for builtin metatypes, which do not use Q_DECLARE_METATYPE. And even if a user would use Q_DECLARE_METATYPE with them, the worst that happens is a superfluous type normalization. Fixes: QTBUG-94124 Change-Id: Ie4a993411214fd009a604de44306131c647095eb Reviewed-by: Andrei Golubev <andrei.golubev@qt.io> Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>