diff --git a/src/editor/attachment/attachmentview.h b/src/editor/attachment/attachmentview.h
index 3595dba17..0e6717315 100644
--- a/src/editor/attachment/attachmentview.h
+++ b/src/editor/attachment/attachmentview.h
@@ -1,84 +1,85 @@
 /*
  * This file is part of KMail.
  * Copyright (C) 2012-2017 Laurent Montel <montel@kde.org>
  * Copyright (c) 2009 Constantin Berzan <exit3219@gmail.com>
  *
  * Parts based on KMail code by:
  * Copyright (c) 2003 Ingo Kloecker <kloecker@kde.org>
  * Copyright (c) 2007 Thomas McGuire <Thomas.McGuire@gmx.net>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program 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 General Public License for more details.
  *
  * 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, USA.
  */
 
 #ifndef KMAIL_ATTACHMENTVIEW_H
 #define KMAIL_ATTACHMENTVIEW_H
 
 #include <QTreeView>
+#include <KConfigGroup>
 
 class QContextMenuEvent;
 class QToolButton;
 class QLabel;
 namespace MessageComposer {
 class AttachmentModel;
 }
 
 namespace KMail {
 class AttachmentView : public QTreeView
 {
     Q_OBJECT
 
 public:
     /// can't change model afterwards.
     explicit AttachmentView(MessageComposer::AttachmentModel *model, QWidget *parent = nullptr);
     ~AttachmentView();
 
     QWidget *widget() const;
 
 public Q_SLOTS:
     /// model sets these
     void setEncryptEnabled(bool enabled);
     void setSignEnabled(bool enabled);
     void hideIfEmpty();
     void selectNewAttachment();
 
     void updateAttachmentLabel();
 
 protected:
     /** reimpl to avoid default drag cursor */
     void startDrag(Qt::DropActions supportedActions) override;
     void contextMenuEvent(QContextMenuEvent *event) override;
     void keyPressEvent(QKeyEvent *event) override;
     /** reimpl to avoid drags from ourselves */
     void dragEnterEvent(QDragEnterEvent *event) override;
 
 private:
     void slotShowHideAttchementList(bool);
     void saveHeaderState();
     void restoreHeaderState();
 
 Q_SIGNALS:
     void contextMenuRequested();
     void modified(bool);
 
 private:
     MessageComposer::AttachmentModel *mModel = nullptr;
     QToolButton *mToolButton = nullptr;
     QLabel *mInfoAttachment = nullptr;
     QWidget *mWidget = nullptr;
     KConfigGroup grp;
 };
 } // namespace KMail
 
 #endif // KMAIL_ATTACHMENTVIEW_H