1 files changed, 1 insertions, 0 deletions
diff --git a/src/serialbus/qmodbuspdu.h b/src/serialbus/qmodbuspdu.h
index e93ec4c..9372730 100644
--- a/src/serialbus/qmodbuspdu.h
+++ b/src/serialbus/qmodbuspdu.h
@@ -183,6 +183,7 @@ private:
     FunctionCode m_code = Invalid;
     QByteArray m_data;
     friend class QModbusSerialAdu;
+    friend struct QModbusPduPrivate;
 };
 Q_SERIALBUS_EXPORT QDebug operator<<(QDebug debug, const QModbusPdu &pdu);
 Q_SERIALBUS_EXPORT QDataStream &operator<<(QDataStream &stream, const QModbusPdu &pdu);