diff --git a/src/widgets/kernel/qsizepolicy.h b/src/widgets/kernel/qsizepolicy.h
index 7674a8e922..2235082f17 100644
--- a/src/widgets/kernel/qsizepolicy.h
+++ b/src/widgets/kernel/qsizepolicy.h
@@ -216,6 +216,8 @@ private:
 #if QT_VERSION >= QT_VERSION_CHECK(6,0,0)
 // Can't add in Qt 5, as QList<QSizePolicy> would be BiC:
 Q_DECLARE_TYPEINFO(QSizePolicy, Q_PRIMITIVE_TYPE);
+#else
+Q_DECLARE_TYPEINFO(QSizePolicy, Q_RELOCATABLE_TYPE);
 #endif
 
 Q_DECLARE_OPERATORS_FOR_FLAGS(QSizePolicy::ControlTypes)