diff --git a/akonadi/session_p.h b/akonadi/session_p.h
index cfed0e56a..0c7653196 100644
--- a/akonadi/session_p.h
+++ b/akonadi/session_p.h
@@ -1,115 +1,115 @@
 /*
     Copyright (c) 2007 Volker Krause <vkrause@kde.org>
 
     This library is free software; you can redistribute it and/or modify it
     under the terms of the GNU Library General Public License as published by
     the Free Software Foundation; either version 2 of the License, or (at your
     option) any later version.
 
     This library is distributed in the hope that it will be useful, but WITHOUT
     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
     License for more details.
 
     You should have received a copy of the GNU Library General Public License
     along with this library; see the file COPYING.LIB.  If not, write to the
     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
     02110-1301, USA.
 */
 
 #ifndef AKONADI_SESSION_P_H
 #define AKONADI_SESSION_P_H
 
 #include "session.h"
 #include "imapparser_p.h"
 
 #include <QtNetwork/QLocalSocket>
 
 #include <QtCore/QQueue>
 #include <QtCore/QSettings>
 #include <QtCore/QThreadStorage>
 
 class QLocalSocket;
 
 namespace Akonadi {
 
 /**
  * @internal
  */
 class SessionPrivate
 {
   public:
     SessionPrivate( Session *parent )
       : mParent( parent ), mConnectionSettings( 0 ), protocolVersion( 0 )
     {
       parser = new ImapParser();
     }
 
     ~SessionPrivate()
     {
       delete parser;
       delete mConnectionSettings;
     }
 
     void startNext();
     void reconnect();
     void socketDisconnected();
     void socketError( QLocalSocket::LocalSocketError error );
     void dataReceived();
     void doStartNext();
     void startJob( Job* job );
     void jobDone( KJob* job );
     void jobWriteFinished( Akonadi::Job* job );
     void jobDestroyed( QObject *job );
 
     bool canPipelineNext();
 
     /**
      * Creates a new default session for this thread with
      * the given @p sessionId. The session can be accessed
      * later by defaultSession().
      *
      * You only need to call this method if you want that the
      * default session has a special custom id, otherwise a random unique
      * id is used automatically.
      */
     static void createDefaultSession( const QByteArray &sessionId );
 
     /**
       Associates the given Job object with this session.
     */
     void addJob( Job* job );
 
     /**
       Returns the next IMAP tag.
     */
     int nextTag();
 
     /**
       Sends the given raw data.
     */
     void writeData( const QByteArray &data );
 
-    static int minimumProtocolVersion() { return 17; }
+    static int minimumProtocolVersion() { return 18; }
 
     Session *mParent;
     QByteArray sessionId;
     QSettings *mConnectionSettings;
     QLocalSocket* socket;
     bool connected;
     int theNextTag;
     int protocolVersion;
 
     // job management
     QQueue<Job*> queue;
     QQueue<Job*> pipeline;
     Job* currentJob;
     bool jobRunning;
 
     // parser stuff
     ImapParser *parser;
 };
 
 }
 
 #endif