diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,7 +7,6 @@
 
 find_package(Qt5 REQUIRED NO_MODULE COMPONENTS Widgets Svg Test)
 find_package(KF5 REQUIRED COMPONENTS I18n KIO ConfigWidgets NewStuff Archive KCMUtils IconThemes DBusAddons)
-find_package(X11 REQUIRED)
 find_package(GTK3 REQUIRED)
 find_package(GSettingSchemas REQUIRED)
 
diff --git a/kded/configvalueprovider.h b/kded/configvalueprovider.h
--- a/kded/configvalueprovider.h
+++ b/kded/configvalueprovider.h
@@ -43,6 +43,7 @@
     QString iconsInMenus() const;
     QString toolbarStyle(ToolbarStyleNotation notation) const;
     QString scrollbarBehavior() const;
+    QString preferDarkTheme() const;
 
 private:
     QString toolbarStyleInDesiredNotation(const QString &kdeConfigValue, ToolbarStyleNotation notation) const;
diff --git a/kded/configvalueprovider.cpp b/kded/configvalueprovider.cpp
--- a/kded/configvalueprovider.cpp
+++ b/kded/configvalueprovider.cpp
@@ -20,6 +20,7 @@
 
 #include <QFont>
 #include <QString>
+#include <QColor>
 
 #include <KConfig>
 #include <KIconTheme>
@@ -110,6 +111,21 @@
     }
 }
 
+QString ConfigValueProvider::preferDarkTheme() const
+{
+    kdeglobalsConfig->reparseConfiguration();
+    KConfigGroup colorsConfigGroup = kdeglobalsConfig->group(QStringLiteral("Colors:Window"));
+    QColor windowBackgroundColor = colorsConfigGroup.readEntry(QStringLiteral("BackgroundNormal"), QColor(239, 240, 241));
+    const int windowBackgroundGray = qGray(windowBackgroundColor.rgb());
+
+    // We use heuristic to determine if current color scheme is dark or not
+    if (windowBackgroundGray >= 192) {
+        return QStringLiteral("0");
+    } else {
+        return QStringLiteral("1");
+    }
+}
+
 QString ConfigValueProvider::toolbarStyleInDesiredNotation(const QString &kdeConfigValue, ConfigValueProvider::ToolbarStyleNotation notation) const
 {
     QStringList toolbarStyles {};
diff --git a/kded/gtkconfig.h b/kded/gtkconfig.h
--- a/kded/gtkconfig.h
+++ b/kded/gtkconfig.h
@@ -63,6 +63,7 @@
     void setIconsInMenus() const;
     void setToolbarStyle() const;
     void setScrollbarBehavior() const;
+    void setDarkThemePreference() const;
 
     void applyAllSettings() const;
 
diff --git a/kded/gtkconfig.cpp b/kded/gtkconfig.cpp
--- a/kded/gtkconfig.cpp
+++ b/kded/gtkconfig.cpp
@@ -115,6 +115,12 @@
     ConfigEditor::setGtk3ConfigValueXSettingsd(QStringLiteral("Gtk/PrimaryButtonWarpsSlider"), scrollbarBehavior);
 }
 
+void GtkConfig::setDarkThemePreference() const
+{
+    const QString preferDarkTheme = configValueProvider->preferDarkTheme();
+    ConfigEditor::setGtk3ConfigValueSettingsIni(QStringLiteral("gtk-application-prefer-dark-theme"), preferDarkTheme);
+}
+
 void GtkConfig::applyAllSettings() const
 {
     setFont();
@@ -124,6 +130,7 @@
     setIconsInMenus();
     setToolbarStyle();
     setScrollbarBehavior();
+    setDarkThemePreference();
 }
 
 void GtkConfig::onGlobalSettingsChange(int settingsChangeType, int arg) const
@@ -139,6 +146,8 @@
         setToolbarStyle();
     } else if (changeType == SettingsChangeType::Settings && settingsCategory == SettingsCategory::Mouse) {
         setScrollbarBehavior();
+    } else if (changeType == SettingsChangeType::Palette) {
+        setDarkThemePreference();
     }
 }
 
diff --git a/src/appearancegtk3.h b/src/appearancegtk3.h
--- a/src/appearancegtk3.h
+++ b/src/appearancegtk3.h
@@ -36,8 +36,6 @@
     bool loadSettings() override;
     bool saveSettings(const QString &file) const override;
     bool loadSettings(const QString &path) override;
-    bool getApplicationPreferDarkTheme() const;
-    void setApplicationPreferDarkTheme(bool enable);
 
 private:
     QString defaultConfigFile() const;
diff --git a/src/appearancegtk3.cpp b/src/appearancegtk3.cpp
--- a/src/appearancegtk3.cpp
+++ b/src/appearancegtk3.cpp
@@ -29,7 +29,6 @@
 #include <KConfigGroup>
 
 #include <gio/gio.h>
-#include <gtk/gtk.h>
 
 #include "appearancegtk3.h"
 
@@ -64,7 +63,6 @@
     KConfigGroup group(file, QStringLiteral("Settings"));
 
     group.writeEntry(QStringLiteral("gtk-theme-name"), m_settings["theme"]);
-    group.writeEntry(QStringLiteral("gtk-application-prefer-dark-theme"), m_settings[QStringLiteral("application_prefer_dark_theme")]);
 
     const bool sync = group.sync();
     Q_ASSERT(sync);
@@ -80,12 +78,9 @@
         return false;
     }
 
-    m_settings = QMap<QString, QString> {
-        {QStringLiteral("application_prefer_dark_theme"), QStringLiteral("false")}
-    };
+    m_settings.clear();
 
     m_settings[QStringLiteral("theme")] = group.readEntry(QStringLiteral("gtk-theme-name"));
-    m_settings[QStringLiteral("application_prefer_dark_theme")] = group.readEntry(QStringLiteral("gtk-application-prefer-dark-theme"));
     for(auto it = m_settings.begin(); it != m_settings.end(); ) {
         if (it.value().isEmpty()) {
             it = m_settings.erase(it);
@@ -111,16 +106,6 @@
     return root + '/' + configFileName();
 }
 
-bool AppearanceGTK3::getApplicationPreferDarkTheme() const
-{
-    return m_settings[QStringLiteral("application_prefer_dark_theme")] == QStringLiteral("1") || m_settings[QStringLiteral("application_prefer_dark_theme")] == QStringLiteral("true");
-}
-
-void AppearanceGTK3::setApplicationPreferDarkTheme(bool enable)
-{
-    m_settings[QStringLiteral("application_prefer_dark_theme")] = enable ? QStringLiteral("true") : QStringLiteral("false");
-}
-
 bool AppearanceGTK3::saveSettings(const QString& file) const
 {
     auto cfg = KSharedConfig::openConfig(file, KConfig::NoGlobals);
@@ -148,8 +133,6 @@
     g_autoptr(GSettings) gsettings = g_settings_new("org.gnome.desktop.interface");
     g_settings_set_string(gsettings, "gtk-theme", m_settings["theme"].toUtf8().constData());
 
-    g_object_set(gtk_settings_get_default(), "gtk-application-prefer-dark-theme", getApplicationPreferDarkTheme(), nullptr);
-
     auto cfg = KSharedConfig::openConfig(configFileName(), KConfig::NoGlobals);
     return saveSettings(cfg);
 }
diff --git a/src/appearencegtk.h b/src/appearencegtk.h
--- a/src/appearencegtk.h
+++ b/src/appearencegtk.h
@@ -41,11 +41,9 @@
 
     void setTheme(const QString &);
     void setThemeGtk3(const QString &theme);
-    void setApplicationPreferDarkTheme(bool enable);
     
     QString getTheme() const;
     QString getThemeGtk3() const;
-    bool getApplicationPreferDarkTheme() const;
    
     bool loadFileConfig();
     bool saveFileConfig();
diff --git a/src/appearencegtk.cpp b/src/appearencegtk.cpp
--- a/src/appearencegtk.cpp
+++ b/src/appearencegtk.cpp
@@ -58,16 +58,6 @@
     return gtk3Appearance()->setTheme(name);
 }
 
-bool AppearenceGTK::getApplicationPreferDarkTheme() const
-{
-    return ((AppearanceGTK3*)gtk3Appearance())->getApplicationPreferDarkTheme();
-}
-
-void AppearenceGTK::setApplicationPreferDarkTheme(bool enable)
-{
-    return ((AppearanceGTK3*)gtk3Appearance())->setApplicationPreferDarkTheme(enable);
-}
-
 bool AppearenceGTK::loadFileConfig()
 {
     bool correct = false;
diff --git a/src/gtkconfigkcmodule.cpp b/src/gtkconfigkcmodule.cpp
--- a/src/gtkconfigkcmodule.cpp
+++ b/src/gtkconfigkcmodule.cpp
@@ -93,7 +93,6 @@
     // UI changes
     connect(ui->cb_theme, SIGNAL(currentIndexChanged(int)), this, SLOT(appChanged()));
     connect(ui->cb_theme_gtk3, SIGNAL(currentIndexChanged(int)), this, SLOT(appChanged()));
-    connect(ui->checkBox_theme_gtk3_prefer_dark, &QAbstractButton::clicked, this, &GTKConfigKCModule::appChanged);
 
     // Preview updates
     connect(ui->gtk2Preview, &QAbstractButton::clicked, this, &GTKConfigKCModule::runGtk2IfNecessary);
@@ -126,7 +125,6 @@
 {
     appareance->setThemeGtk3(ui->cb_theme_gtk3->currentText());
     appareance->setTheme(ui->cb_theme->currentText());
-    appareance->setApplicationPreferDarkTheme(ui->checkBox_theme_gtk3_prefer_dark->isChecked());
 }
 
 void GTKConfigKCModule::showThemeGHNS()
@@ -348,10 +346,6 @@
         useConfig ? appareance->getThemeGtk3() : ui->cb_theme_gtk3->currentText(),
         appareance->gtk3Appearance()->installedThemesNames());
 
-    // Dark theme for gtk3
-    ui->checkBox_theme_gtk3_prefer_dark->setChecked(appareance->getApplicationPreferDarkTheme());
-
-    
     m_saveEnabled = wasenabled;
     emit changed(true);
 }
diff --git a/src/ui/gui.ui b/src/ui/gui.ui
--- a/src/ui/gui.ui
+++ b/src/ui/gui.ui
@@ -90,13 +90,6 @@
          </item>
         </layout>
        </item>
-       <item row="2" column="1">
-        <widget class="QCheckBox" name="checkBox_theme_gtk3_prefer_dark">
-         <property name="text">
-          <string>Prefer dark theme</string>
-         </property>
-        </widget>
-       </item>
       </layout>
      </item>
      <item>
@@ -162,7 +155,4 @@
  </widget>
  <resources/>
  <connections/>
- <buttongroups>
-  <buttongroup name="buttonGroup_primary_button_warps_slider"/>
- </buttongroups>
 </ui>
diff --git a/tests/configsavetest.cpp b/tests/configsavetest.cpp
--- a/tests/configsavetest.cpp
+++ b/tests/configsavetest.cpp
@@ -17,11 +17,6 @@
 static void fillValues(QScopedPointer<AbstractAppearance>& a)
 {
     a->setTheme("a");
-
-    auto a3 = dynamic_cast<AppearanceGTK3*>(a.data());
-    if (a3) {
-        a3->setApplicationPreferDarkTheme(false);
-    }
 }
 
 void compareAppearances(QScopedPointer<AbstractAppearance>& reloaded, QScopedPointer<AbstractAppearance>& instance)