diff --git a/sandbox/WpfApp1/MainWindow.xaml.cs b/sandbox/WpfApp1/MainWindow.xaml.cs
index 7ad02e2b..749796fc 100644
--- a/sandbox/WpfApp1/MainWindow.xaml.cs
+++ b/sandbox/WpfApp1/MainWindow.xaml.cs
@@ -18,7 +18,7 @@ public MainWindow()
 
 
 
-        R3.WPF.WpfProviderInitializer.SetDefaultObservableSystem(ex => Trace.WriteLine($"R3 UnhandledException:{ex}"));
+        WpfProviderInitializer.SetDefaultObservableSystem(ex => Trace.WriteLine($"R3 UnhandledException:{ex}"));
 
 
 
diff --git a/src/R3.Avalonia/AppBuilderR3InitializeExtensions.cs b/src/R3.Avalonia/AppBuilderR3InitializeExtensions.cs
index 18e45899..af8c0ff8 100644
--- a/src/R3.Avalonia/AppBuilderR3InitializeExtensions.cs
+++ b/src/R3.Avalonia/AppBuilderR3InitializeExtensions.cs
@@ -1,5 +1,5 @@
 using Avalonia.Threading;
-using R3.Avalonia;
+using R3;
 
 namespace Avalonia; // Avalonia namespace