diff --git a/src/kmanagesieve/sievejob_p.h b/src/kmanagesieve/sievejob_p.h
index c81fb5e..7a36db2 100644
--- a/src/kmanagesieve/sievejob_p.h
+++ b/src/kmanagesieve/sievejob_p.h
@@ -1,76 +1,76 @@
 /*  -*- c++ -*-
     sievejob.h
 
     KMail, the KDE mail client.
     Copyright (c) 2002 Marc Mutz <mutz@kde.org>
 
     This program is free software; you can redistribute it and/or
     modify it under the terms of the GNU General Public License,
     version 2.0, as published by the Free Software Foundation.
     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software Foundation,
     Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, US
 */
 
 #ifndef KSIEVE_KMANAGESIEVE_SIEVEJOB_P_H
 #define KSIEVE_KMANAGESIEVE_SIEVEJOB_P_H
 
 #include "sievejob.h"
 #include "session.h"
 
 #include <QUrl>
 #include <QPointer>
 #include <QStack>
 
 namespace KManageSieve {
-class SieveJob::Private
+class Q_DECL_HIDDEN SieveJob::Private
 {
 public:
     Private(SieveJob *qq)
         : q(qq)
         , mFileExists(DontKnow)
     {
     }
 
     enum Command {
         Get,
         Put,
         Activate,
         Deactivate,
         SearchActive,
         List,
         Delete,
         Rename,
         Check
     };
 
     enum Existence {
         DontKnow,
         Yes,
         No
     };
 
     static Session *sessionForUrl(const QUrl &url);
 
     void run(Session *session);
     bool handleResponse(const Response &response, const QByteArray &data);
     void killed();
 
     SieveJob *q = nullptr;
     QUrl mUrl;
     QString mScript;
     QString mActiveScriptName;
     QString mErrorMessage;
     QString mNewName;
     QStack<Command> mCommands;
 
     // List of Sieve scripts on the server, used by @ref list()
     QStringList mAvailableScripts;
 
     Existence mFileExists;
 
     static QHash<QUrl, QPointer<Session> > m_sessionPool;
 };
 }
 
 #endif