diff --git a/src/modules/cmdpal/Microsoft.CmdPal.UI/Settings/AppearancePage.xaml.cs b/src/modules/cmdpal/Microsoft.CmdPal.UI/Settings/AppearancePage.xaml.cs
index c93c551db3..c2fd4a1b29 100644
--- a/src/modules/cmdpal/Microsoft.CmdPal.UI/Settings/AppearancePage.xaml.cs
+++ b/src/modules/cmdpal/Microsoft.CmdPal.UI/Settings/AppearancePage.xaml.cs
@@ -29,7 +29,7 @@ public sealed partial class AppearancePage : Page
         InitializeComponent();
 
         var settings = App.Current.Services.GetService<SettingsModel>()!;
-        var themeService = App.Current.Services.GetService<IThemeService>()!;
+        var themeService = App.Current.Services.GetRequiredService<IThemeService>();
         var topLevelCommandManager = App.Current.Services.GetService<TopLevelCommandManager>()!;
         ViewModel = new SettingsViewModel(settings, topLevelCommandManager, _mainTaskScheduler, themeService);
     }