diff --git a/src/GuiApp/Avalonia/FileTime.GuiApp.Font/Font/Startup.cs b/src/GuiApp/Avalonia/FileTime.GuiApp.Font/Font/Startup.cs
index 5a016d3..4308e47 100644
--- a/src/GuiApp/Avalonia/FileTime.GuiApp.Font/Font/Startup.cs
+++ b/src/GuiApp/Avalonia/FileTime.GuiApp.Font/Font/Startup.cs
@@ -9,7 +9,7 @@ public static class Startup
 {
     public static IServiceCollection ConfigureFont(this IServiceCollection services, IConfigurationRoot configurationRoot)
     {
-        services.Configure<FontConfiguration>(configurationRoot.GetSection(FontConfiguration.SectionName));
+        services.AddOptions<FontConfiguration>().Bind(configurationRoot.GetSection(FontConfiguration.SectionName));
         services.AddSingleton<IFontService, FontService>();
         return services;
     }
diff --git a/src/GuiApp/Avalonia/FileTime.GuiApp.Font/Services/FontService.cs b/src/GuiApp/Avalonia/FileTime.GuiApp.Font/Services/FontService.cs
index 0c35124..3bf8f91 100644
--- a/src/GuiApp/Avalonia/FileTime.GuiApp.Font/Services/FontService.cs
+++ b/src/GuiApp/Avalonia/FileTime.GuiApp.Font/Services/FontService.cs
@@ -21,14 +21,12 @@ public class FontService : IFontService
         UpdateFonts(fontConfiguration.CurrentValue, null);
     }
 
-    private void UpdateFonts(FontConfiguration newConfiguration, string? arg2)
-    {
-        _mainFont.OnNext(GetMainFont());
-    }
+    private void UpdateFonts(FontConfiguration newConfiguration, string? _) => _mainFont.OnNext(GetMainFont());
 
-    public string? GetMainFont()
+    public string GetMainFont()
     {
         var installedFonts = FontManager.Current.SystemFonts.Select(f => f.Name).ToList();
-        return _fontConfiguration.CurrentValue.Main.Find(installedFonts.Contains);
+        return _fontConfiguration.CurrentValue.Main.FirstOrDefault(installedFonts.Contains) 
+               ?? FontManager.Current.DefaultFontFamily.Name;
     }
 }
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