diff --git a/src/network/socket/qtcpserver_p.h b/src/network/socket/qtcpserver_p.h
index 71dc4d985f8..b7fae4c1053 100644
--- a/src/network/socket/qtcpserver_p.h
+++ b/src/network/socket/qtcpserver_p.h
@@ -63,7 +63,8 @@
 
 QT_BEGIN_NAMESPACE
 
-class QTcpServerPrivate : public QObjectPrivate, public QAbstractSocketEngineReceiver
+class Q_NETWORK_EXPORT QTcpServerPrivate : public QObjectPrivate,
+                                           public QAbstractSocketEngineReceiver
 {
     Q_DECLARE_PUBLIC(QTcpServer)
 public: