diff --git a/src/corelib/kernel/qmetatype.cpp b/src/corelib/kernel/qmetatype.cpp
index 906334be18c..7ddf187b88a 100644
--- a/src/corelib/kernel/qmetatype.cpp
+++ b/src/corelib/kernel/qmetatype.cpp
@@ -489,6 +489,7 @@ int QMetaType::registerType(const char *typeName, Deleter deleter,
                             Constructor constructor,
                             int size, TypeFlags flags, const QMetaObject *metaObject)
 {
+    Q_UNUSED(metaObject);
     QVector<QCustomTypeInfo> *ct = customTypes();
     if (!ct || !typeName || !deleter || !creator || !destructor || !constructor)
         return -1;