diff --git a/common/themes/theme_manager.cpp b/common/themes/theme_manager.cpp
index 081a7147..e39554be 100644
--- a/common/themes/theme_manager.cpp
+++ b/common/themes/theme_manager.cpp
@@ -4,6 +4,7 @@
 #include "theme_factory.h"
 
 #include <QGuiApplication>
+#include <QPalette>
 #include <QStyleHints>
 
 // TODO: add API to force color scheme     //styleHints->setColorScheme(Qt::ColorScheme::Dark);
@@ -20,6 +21,8 @@ ThemeManager &ThemeManager::instance()
 
 void ThemeManager::initialize()
 {
+    // QStyleHints::colorScheme is only 6.5+
+#if QT_VERSION >= QT_VERSION_CHECK(6, 5, 0)
     auto *styleHints = qGuiApp->styleHints();
 
     auto colorScheme = styleHints->colorScheme();
@@ -32,6 +35,15 @@ void ThemeManager::initialize()
     applyColorScheme(colorScheme);
 
     connect(styleHints, &QStyleHints::colorSchemeChanged, this, applyColorScheme, Qt::QueuedConnection);
+#else
+    auto applyPalette = [this](const QPalette &palette) {
+        setTheme(palette.color(QPalette::Window).lightness() < 128 ? ThemeId::Dark : ThemeId::Light);
+    };
+
+    applyPalette(qGuiApp->palette());
+
+    connect(qGuiApp, &QGuiApplication::paletteChanged, this, applyPalette, Qt::QueuedConnection);
+#endif
 }
 
 void ThemeManager::setTheme(ThemeId themeId)