diff --git a/src/Wpf.Ui/Appearance/SystemThemeManager.cs b/src/Wpf.Ui/Appearance/SystemThemeManager.cs
index de7bff5a7..193d10052 100644
--- a/src/Wpf.Ui/Appearance/SystemThemeManager.cs
+++ b/src/Wpf.Ui/Appearance/SystemThemeManager.cs
@@ -115,12 +115,16 @@ private static SystemTheme GetCurrentSystemTheme()
                 "HKEY_CURRENT_USER\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
                 "AppsUseLightTheme",
                 1
-            ) ?? 1;
+            );
 
         if (rawAppsUseLightTheme is 0)
         {
             return SystemTheme.Dark;
         }
+        else if (rawAppsUseLightTheme is 1)
+        {
+            return SystemTheme.Light;
+        }
 
         var rawSystemUsesLightTheme =
             Registry.GetValue(