diff --git a/src/corelib/io/qiodevice.cpp b/src/corelib/io/qiodevice.cpp
index ea8a32d8d57..585a07158ea 100644
--- a/src/corelib/io/qiodevice.cpp
+++ b/src/corelib/io/qiodevice.cpp
@@ -129,8 +129,12 @@ static void checkWarnMessage(const QIODevice *device, const char *function, cons
 /*!
     \internal
  */
-QIODevicePrivate::QIODevicePrivate()
+QIODevicePrivate::QIODevicePrivate(decltype(QObjectPrivateVersion) version)
+#ifndef QT_NO_QOBJECT
+    : QObjectPrivate(version)
+#endif
 {
+    Q_UNUSED(version);
 }
 
 /*!
diff --git a/src/corelib/io/qiodevice_p.h b/src/corelib/io/qiodevice_p.h
index 9f45e828312..151548fb04e 100644
--- a/src/corelib/io/qiodevice_p.h
+++ b/src/corelib/io/qiodevice_p.h
@@ -23,6 +23,8 @@
 #include "private/qringbuffer_p.h"
 #ifndef QT_NO_QOBJECT
 #include "private/qobject_p.h"
+#else
+static constexpr int QObjectPrivateVersion = QT_VERSION;
 #endif
 
 QT_BEGIN_NAMESPACE
@@ -42,7 +44,7 @@ class Q_CORE_EXPORT QIODevicePrivate
     Q_DISABLE_COPY_MOVE(QIODevicePrivate)
 
 public:
-    QIODevicePrivate();
+    QIODevicePrivate(decltype(QObjectPrivateVersion) version = QObjectPrivateVersion);
     virtual ~QIODevicePrivate();
 
     enum class ReadLineOption {
diff --git a/src/gui/kernel/qwindow.cpp b/src/gui/kernel/qwindow.cpp
index 50f495158e6..072389e8598 100644
--- a/src/gui/kernel/qwindow.cpp
+++ b/src/gui/kernel/qwindow.cpp
@@ -205,8 +205,9 @@ QWindow::~QWindow()
     d->isWindow = false;
 }
 
-QWindowPrivate::QWindowPrivate()
-    = default;
+QWindowPrivate::QWindowPrivate(decltype(QObjectPrivateVersion) version)
+    : QObjectPrivate(version)
+{}
 
 QWindowPrivate::~QWindowPrivate()
     = default;
diff --git a/src/gui/kernel/qwindow_p.h b/src/gui/kernel/qwindow_p.h
index 0d513285173..3f57e6be11e 100644
--- a/src/gui/kernel/qwindow_p.h
+++ b/src/gui/kernel/qwindow_p.h
@@ -41,7 +41,7 @@ public:
         WindowFrameExclusive
     };
 
-    QWindowPrivate();
+    QWindowPrivate(decltype(QObjectPrivateVersion) version = QObjectPrivateVersion);
     ~QWindowPrivate() override;
 
     void init(QWindow *parent, QScreen *targetScreen = nullptr);
diff --git a/src/network/socket/qabstractsocket.cpp b/src/network/socket/qabstractsocket.cpp
index 9976a9c1260..7d871d57584 100644
--- a/src/network/socket/qabstractsocket.cpp
+++ b/src/network/socket/qabstractsocket.cpp
@@ -493,7 +493,8 @@ static bool isProxyError(QAbstractSocket::SocketError error)
 
     Constructs a QAbstractSocketPrivate. Initializes all members.
 */
-QAbstractSocketPrivate::QAbstractSocketPrivate()
+QAbstractSocketPrivate::QAbstractSocketPrivate(decltype(QObjectPrivateVersion) version)
+    : QIODevicePrivate(version)
 {
     writeBufferChunkSize = QABSTRACTSOCKET_BUFFERSIZE;
 }
diff --git a/src/network/socket/qabstractsocket_p.h b/src/network/socket/qabstractsocket_p.h
index cc5f53179c0..80467a724e0 100644
--- a/src/network/socket/qabstractsocket_p.h
+++ b/src/network/socket/qabstractsocket_p.h
@@ -32,7 +32,7 @@ class QAbstractSocketPrivate : public QIODevicePrivate, public QAbstractSocketEn
 {
     Q_DECLARE_PUBLIC(QAbstractSocket)
 public:
-    QAbstractSocketPrivate();
+    QAbstractSocketPrivate(decltype(QObjectPrivateVersion) version = QObjectPrivateVersion);
     virtual ~QAbstractSocketPrivate();
 
     // from QAbstractSocketEngineReceiver