diff --git a/src/knowledgedb-generator/wikidata.cpp b/src/knowledgedb-generator/wikidata.cpp
index bf234ef..7f0876e 100644
--- a/src/knowledgedb-generator/wikidata.cpp
+++ b/src/knowledgedb-generator/wikidata.cpp
@@ -1,84 +1,85 @@
 /*
     Copyright (C) 2018 Volker Krause <vkrause@kde.org>
 
     This program 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 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 Library General Public
     License for more details.
 
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
 #include "wikidata.h"
 
 #include <QCoreApplication>
+#include <QDebug>
 #include <QDir>
 #include <QFile>
 #include <QJsonArray>
 #include <QJsonDocument>
 #include <QJsonObject>
 #include <QNetworkAccessManager>
 #include <QNetworkReply>
 #include <QString>
 #include <QUrl>
 #include <QUrlQuery>
 
 using namespace KItinerary;
 using namespace KItinerary::Generator;
 
 KnowledgeDb::Coordinate WikiData::parseCoordinate(const QString& value)
 {
     const auto idx = value.indexOf(QLatin1Char(' '));
     bool latOk = false, longOk = false;
     KnowledgeDb::Coordinate c;
     c.longitude = value.midRef(6, idx - 6).toFloat(&latOk);
     c.latitude = value.midRef(idx + 1, value.size() - idx - 2).toFloat(&longOk);
     if (!latOk || !longOk) {
         c.longitude = NAN;
         c.latitude = NAN;
     }
     return c;
 }
 
 QJsonArray WikiData::query(const char *sparqlQuery, const char *cacheFileName)
 {
     QDir().mkdir(QStringLiteral("data"));
     QFile cacheFile(QLatin1String("data/") + QString::fromUtf8(cacheFileName));
     QByteArray data;
     if (cacheFile.exists() && qEnvironmentVariableIsSet("KITINERARY_USE_WIKIDATA_CACHE")) {
         cacheFile.open(QFile::ReadOnly);
         data = cacheFile.readAll();
         cacheFile.close();
     }
 
     if (data.isEmpty()) {
         QUrl url(QStringLiteral("https://query.wikidata.org/sparql"));
         QUrlQuery query;
         query.addQueryItem(QStringLiteral("query"), QString::fromUtf8(sparqlQuery).trimmed().simplified());
         query.addQueryItem(QStringLiteral("format"), QStringLiteral("json"));
         url.setQuery(query);
 
         QNetworkAccessManager nam;
         auto reply = nam.get(QNetworkRequest(url));
         QObject::connect(reply, &QNetworkReply::finished, QCoreApplication::instance(), &QCoreApplication::quit);
         QCoreApplication::exec();
         if (reply->error() != QNetworkReply::NoError) {
             qWarning() << reply->errorString();
             return {};
         }
 
         data = reply->readAll();
         cacheFile.open(QFile::WriteOnly);
         cacheFile.write(data);
     }
 
     const auto doc = QJsonDocument::fromJson(data);
     const auto resultArray = doc.object().value(QLatin1String("results")).toObject().value(QLatin1String("bindings")).toArray();
     return resultArray;
 }