diff --git a/lang/qt/src/qgpgmesignkeyjob.cpp b/lang/qt/src/qgpgmesignkeyjob.cpp
index 1d36d95a..ee0c5379 100644
--- a/lang/qt/src/qgpgmesignkeyjob.cpp
+++ b/lang/qt/src/qgpgmesignkeyjob.cpp
@@ -1,156 +1,156 @@
 /*
     qgpgmesignkeyjob.cpp
 
     This file is part of qgpgme, the Qt API binding for gpgme
     Copyright (c) 2008 Klarälvdalens Datakonsult AB
     Copyright (c) 2016 by Bundesamt für Sicherheit in der Informationstechnik
     Software engineering by Intevation GmbH
 
     QGpgME 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.
 
     QGpgME 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
 
     In addition, as a special exception, the copyright holders give
     permission to link the code of this program with any edition of
     the Qt library by Trolltech AS, Norway (or with modified versions
     of Qt that use the same license as Qt), and distribute linked
     combinations including the two.  You must obey the GNU General
     Public License in all respects for all of the code used other than
     Qt.  If you modify this file, you may extend this exception to
     your version of the file, but you are not obligated to do so.  If
     you do not wish to do so, delete this exception statement from
     your version.
 */
 
 #ifdef HAVE_CONFIG_H
  #include "config.h"
 #endif
 
 #include "qgpgmesignkeyjob.h"
 
 #include "dataprovider.h"
 
 #include "context.h"
 #include "data.h"
 #include "gpgsignkeyeditinteractor.h"
 
 #include <cassert>
 #include <memory>
 
 using namespace QGpgME;
 using namespace GpgME;
 
 QGpgMESignKeyJob::QGpgMESignKeyJob(Context *context)
     : mixin_type(context),
       m_userIDsToSign(),
       m_signingKey(),
       m_checkLevel(0),
       m_exportable(false),
       m_nonRevocable(false),
       m_started(false),
       m_dupeOk(false)
 {
     lateInitialization();
 }
 
 QGpgMESignKeyJob::~QGpgMESignKeyJob() {}
 
 static QGpgMESignKeyJob::result_type sign_key(Context *ctx, const Key &key, const std::vector<unsigned int> &uids,
                                               unsigned int checkLevel, const Key &signer, unsigned int opts,
                                               bool dupeOk, const QString &remark)
 {
     QGpgME::QByteArrayDataProvider dp;
     Data data(&dp);
 
     GpgSignKeyEditInteractor *skei(new GpgSignKeyEditInteractor);
     skei->setUserIDsToSign(uids);
     skei->setCheckLevel(checkLevel);
     skei->setSigningOptions(opts);
     skei->setKey(key);
 
     if (dupeOk) {
         ctx->setFlag("extended-edit", "1");
         skei->setDupeOk(true);
     }
 
-    if (!remark.isNull()) {
+    if (!remark.isEmpty()) {
         ctx->addSignatureNotation("rem@gnupg.org", remark.toUtf8().constData());
     }
 
     if (!signer.isNull())
         if (const Error err = ctx->addSigningKey(signer)) {
             return std::make_tuple(err, QString(), Error());
         }
     const Error err = ctx->edit(key, std::unique_ptr<EditInteractor> (skei), data);
     Error ae;
     const QString log = _detail::audit_log_as_html(ctx, ae);
     return std::make_tuple(err, log, ae);
 }
 
 Error QGpgMESignKeyJob::start(const Key &key)
 {
     unsigned int opts = 0;
     if (m_nonRevocable) {
         opts |= GpgSignKeyEditInteractor::NonRevocable;
     }
     if (m_exportable) {
         opts |= GpgSignKeyEditInteractor::Exportable;
     }
     run(std::bind(&sign_key, std::placeholders::_1, key, m_userIDsToSign, m_checkLevel, m_signingKey, opts,
                   m_dupeOk, m_remark));
     m_started = true;
     return Error();
 }
 
 void QGpgMESignKeyJob::setUserIDsToSign(const std::vector<unsigned int> &idsToSign)
 {
     assert(!m_started);
     m_userIDsToSign = idsToSign;
 }
 
 void QGpgMESignKeyJob::setCheckLevel(unsigned int checkLevel)
 {
     assert(!m_started);
     m_checkLevel = checkLevel;
 }
 
 void QGpgMESignKeyJob::setExportable(bool exportable)
 {
     assert(!m_started);
     m_exportable = exportable;
 }
 
 void QGpgMESignKeyJob::setSigningKey(const Key &key)
 {
     assert(!m_started);
     m_signingKey = key;
 }
 
 void QGpgMESignKeyJob::setNonRevocable(bool nonRevocable)
 {
     assert(!m_started);
     m_nonRevocable = nonRevocable;
 }
 
 void QGpgMESignKeyJob::setRemark(const QString &remark)
 {
     assert(!m_started);
     m_remark = remark;
 }
 
 void QGpgMESignKeyJob::setDupeOk(bool value)
 {
     assert(!m_started);
     m_dupeOk = value;
 }
 #include "qgpgmesignkeyjob.moc"