diff --git a/src/gui/src/DeskflowApplication.cpp b/src/gui/src/DeskflowApplication.cpp
deleted file mode 100644
index 4a272e06a..000000000
--- a/src/gui/src/DeskflowApplication.cpp
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
- * Deskflow -- mouse and keyboard sharing utility
- * Copyright (C) 2012 Symless Ltd.
- * Copyright (C) 2008 Volker Lanz (vl@fidra.de)
- *
- * This package is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * found in the file LICENSE that should have accompanied this file.
- *
- * This package 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, see <http://www.gnu.org/licenses/>.
- */
-
-#include "DeskflowApplication.h"
-
-#include "MainWindow.h"
-
-DeskflowApplication::DeskflowApplication(int &argc, char **argv) : QApplication(argc, argv)
-{
-
-  if (qEnvironmentVariable("XDG_CURRENT_DESKTOP") != QLatin1String("KDE")) {
-    // causes dark mode to be used on some OS (e.g. Windows)
-    setStyle("fusion");
-  }
-}
diff --git a/src/gui/src/DeskflowApplication.h b/src/gui/src/DeskflowApplication.h
deleted file mode 100644
index caa89f87a..000000000
--- a/src/gui/src/DeskflowApplication.h
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
- * Deskflow -- mouse and keyboard sharing utility
- * Copyright (C) 2012 Symless Ltd.
- * Copyright (C) 2008 Volker Lanz (vl@fidra.de)
- *
- * This package is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * found in the file LICENSE that should have accompanied this file.
- *
- * This package 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, see <http://www.gnu.org/licenses/>.
- */
-
-#pragma once
-
-#include <QApplication>
-
-class QSessionManager;
-
-class DeskflowApplication : public QApplication
-{
-public:
-  DeskflowApplication(int &argc, char **argv);
-  ~DeskflowApplication() override = default;
-};
diff --git a/src/gui/src/main.cpp b/src/gui/src/main.cpp
index 30113434e..a34711ad8 100644
--- a/src/gui/src/main.cpp
+++ b/src/gui/src/main.cpp
@@ -16,7 +16,6 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "DeskflowApplication.h"
 #include "MainWindow.h"
 #include "SetupWizard.h"
 #include "common/constants.h"
@@ -83,7 +82,14 @@ int main(int argc, char *argv[])
   // used as a prefix for settings paths, and must not be a url.
   QCoreApplication::setOrganizationDomain(kOrgDomain);
 
-  DeskflowApplication app(argc, argv);
+  QApplication app(argc, argv);
+
+#if !defined(Q_OS_MAC)
+  // causes dark mode to be used on some DE's
+  if (qEnvironmentVariable("XDG_CURRENT_DESKTOP") != QLatin1String("KDE")) {
+    qApp->setStyle("fusion");
+  }
+#endif
 
   qInstallMessageHandler(deskflow::gui::messages::messageHandler);
   QString version = QString::fromStdString(deskflow::version());
@@ -136,16 +142,13 @@ int main(int argc, char *argv[])
   }
 
   MainWindow mainWindow(configScopes, appConfig);
-
-  QObject::connect(&app, &DeskflowApplication::aboutToQuit, &mainWindow, &MainWindow::onAppAboutToQuit);
-
   mainWindow.open();
 
 #ifdef DESKFLOW_GUI_HOOK_START
   DESKFLOW_GUI_HOOK_START
 #endif
 
-  return DeskflowApplication::exec();
+  return qApp->exec();
 }
 
 #if defined(Q_OS_MAC)