diff --git a/src/Ursa.Themes.Semi/Index.axaml.cs b/src/Ursa.Themes.Semi/Index.axaml.cs
index c7945a9..a0eeea4 100644
--- a/src/Ursa.Themes.Semi/Index.axaml.cs
+++ b/src/Ursa.Themes.Semi/Index.axaml.cs
@@ -20,6 +20,7 @@ public class SemiTheme: Styles
     private readonly IServiceProvider? sp;
     public SemiTheme(IServiceProvider? provider = null)
     {
+        sp = provider;
         AvaloniaXamlLoader.Load(provider, this);
     }