diff --git a/src/corelib/kernel/qobject.cpp b/src/corelib/kernel/qobject.cpp
index d5ef3ff8163..9c3e67c781b 100644
--- a/src/corelib/kernel/qobject.cpp
+++ b/src/corelib/kernel/qobject.cpp
@@ -173,6 +173,12 @@ int  (*QAbstractDeclarativeData::receivers)(QAbstractDeclarativeData *, const QO
 bool (*QAbstractDeclarativeData::isSignalConnected)(QAbstractDeclarativeData *, const QObject *, int) = 0;
 void (*QAbstractDeclarativeData::setWidgetParent)(QObject *, QObject *) = 0;
 
+/*!
+    \fn QObjectData::QObjectData()
+    \internal
+ */
+
+
 QObjectData::~QObjectData() {}
 
 QMetaObject *QObjectData::dynamicMetaObject() const
@@ -4168,6 +4174,11 @@ uint QObject::registerUserData()
     return user_data_registration++;
 }
 
+/*!
+    \fn QObjectUserData::QObjectUserData()
+    \internal
+ */
+
 /*!
     \internal
  */
diff --git a/src/corelib/kernel/qobject.h b/src/corelib/kernel/qobject.h
index 1d837314412..12512e74c5b 100644
--- a/src/corelib/kernel/qobject.h
+++ b/src/corelib/kernel/qobject.h
@@ -93,7 +93,9 @@ Q_CORE_EXPORT void qt_qFindChildren_helper(const QObject *parent, const QRegular
 Q_CORE_EXPORT QObject *qt_qFindChild_helper(const QObject *parent, const QString &name, const QMetaObject &mo, Qt::FindChildOptions options);
 
 class Q_CORE_EXPORT QObjectData {
+    Q_DISABLE_COPY(QObjectData)
 public:
+    QObjectData() = default;
     virtual ~QObjectData() = 0;
     QObject *q_ptr;
     QObject *parent;
@@ -472,7 +474,9 @@ inline const QMetaObject *qt_getQtMetaObject() noexcept
 
 #ifndef QT_NO_USERDATA
 class Q_CORE_EXPORT QObjectUserData {
+    Q_DISABLE_COPY(QObjectUserData)
 public:
+    QObjectUserData() = default;
     virtual ~QObjectUserData();
 };
 #endif