diff --git a/src/mixxx.cpp b/src/mixxx.cpp
index d479435bde8..54b30bf3d2b 100644
--- a/src/mixxx.cpp
+++ b/src/mixxx.cpp
@@ -176,7 +176,7 @@ MixxxMainWindow::MixxxMainWindow(QApplication* pApp, const CmdlineArgs& args)
         StatsManager::createInstance();
     }
 
-    m_pSettingsManager = make_parented<SettingsManager>(this, args.getSettingsPath());
+    m_pSettingsManager = std::make_unique<SettingsManager>(args.getSettingsPath());
 
     initializeKeyboard();
 
@@ -284,10 +284,10 @@ void MixxxMainWindow::initialize(QApplication* pApp, const CmdlineArgs& args) {
 
     m_pRecordingManager = new RecordingManager(pConfig, m_pEngine);
 
-
 #ifdef __BROADCAST__
-    m_pBroadcastManager = new BroadcastManager(m_pSettingsManager,
-                                               m_pSoundManager);
+    m_pBroadcastManager = new BroadcastManager(
+            m_pSettingsManager.get(),
+            m_pSoundManager);
 #endif
 
     launchProgress(11);
@@ -470,9 +470,17 @@ void MixxxMainWindow::initialize(QApplication* pApp, const CmdlineArgs& args) {
     }
 
     // Initialize preference dialog
-    m_pPrefDlg = new DlgPreferences(this, m_pSkinLoader, m_pSoundManager, m_pPlayerManager,
-                                    m_pControllerManager, m_pVCManager, pLV2Backend, m_pEffectsManager,
-                                    m_pSettingsManager, m_pLibrary);
+    m_pPrefDlg = new DlgPreferences(
+            this,
+            m_pSkinLoader,
+            m_pSoundManager,
+            m_pPlayerManager,
+            m_pControllerManager,
+            m_pVCManager,
+            pLV2Backend,
+            m_pEffectsManager,
+            m_pSettingsManager.get(),
+            m_pLibrary);
     m_pPrefDlg->setWindowIcon(QIcon(":/images/mixxx_icon.svg"));
     m_pPrefDlg->setHidden(true);
 
@@ -819,11 +827,7 @@ void MixxxMainWindow::finalize() {
     Sandbox::shutdown();
 
     qDebug() << t.elapsed(false).debugMillisWithUnit() << "deleting SettingsManager";
-    {
-        auto* pSettingsManager = m_pSettingsManager.get();
-        m_pSettingsManager = nullptr; // reset parented_ptr
-        delete pSettingsManager;
-    }
+    m_pSettingsManager.reset();
 
     delete m_pKeyboard;
     delete m_pKbdConfig;
diff --git a/src/mixxx.h b/src/mixxx.h
index 387a2909b36..f34157f888e 100644
--- a/src/mixxx.h
+++ b/src/mixxx.h
@@ -1,26 +1,9 @@
-/***************************************************************************
-                          mixxx.h  -  description
-                             -------------------
-    begin                : Mon Feb 18 09:48:17 CET 2002
-    copyright            : (C) 2002 by Tue and Ken Haste Andersen
-    email                :
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
-
-#ifndef MIXXX_H
-#define MIXXX_H
+#pragma once
 
 #include <QMainWindow>
 #include <QSharedPointer>
 #include <QString>
+#include <memory>
 
 #include "preferences/configobject.h"
 #include "preferences/constants.h"
@@ -143,7 +126,7 @@ class MixxxMainWindow : public QMainWindow {
     QWidget* m_pWidgetParent;
     LaunchImage* m_pLaunchImage;
 
-    parented_ptr<SettingsManager> m_pSettingsManager;
+    std::unique_ptr<SettingsManager> m_pSettingsManager;
 
     // The effects processing system
     EffectsManager* m_pEffectsManager;
@@ -204,5 +187,3 @@ class MixxxMainWindow : public QMainWindow {
     static const int kMicrophoneCount;
     static const int kAuxiliaryCount;
 };
-
-#endif
diff --git a/src/preferences/settingsmanager.cpp b/src/preferences/settingsmanager.cpp
index f5bb8c680f8..efae6089815 100644
--- a/src/preferences/settingsmanager.cpp
+++ b/src/preferences/settingsmanager.cpp
@@ -6,10 +6,8 @@
 #include "preferences/upgrade.h"
 #include "util/assert.h"
 
-SettingsManager::SettingsManager(QObject* pParent,
-                                 const QString& settingsPath)
-        : QObject(pParent),
-          m_bShouldRescanLibrary(false) {
+SettingsManager::SettingsManager(const QString& settingsPath)
+        : m_bShouldRescanLibrary(false) {
     // First make sure the settings path exists. If we don't then other parts of
     // Mixxx (such as the library) will produce confusing errors.
     if (!QDir(settingsPath).exists()) {
diff --git a/src/preferences/settingsmanager.h b/src/preferences/settingsmanager.h
index d45ba67754c..2f9dcd9dfbd 100644
--- a/src/preferences/settingsmanager.h
+++ b/src/preferences/settingsmanager.h
@@ -1,17 +1,11 @@
-#ifndef PREFERENCES_SETTINGSMANAGER_H
-#define PREFERENCES_SETTINGSMANAGER_H
-
-#include <QObject>
-#include <QSharedPointer>
-#include <QString>
+#pragma once
 
 #include "preferences/broadcastsettings.h"
 #include "preferences/usersettings.h"
 
-class SettingsManager : public QObject {
-    Q_OBJECT
+class SettingsManager {
   public:
-    SettingsManager(QObject* pParent, const QString& settingsPath);
+    explicit SettingsManager(const QString& settingsPath);
     virtual ~SettingsManager();
 
     UserSettingsPointer settings() const {
@@ -37,5 +31,3 @@ class SettingsManager : public QObject {
     bool m_bShouldRescanLibrary;
     BroadcastSettingsPointer m_pBroadcastSettings;
 };
-
-#endif /* PREFERENCES_SETTINGSMANAGER_H */