diff --git a/samples/BindingDemo/App.xaml.cs b/samples/BindingDemo/App.xaml.cs
index 01c52a2a49..f2f44cd502 100644
--- a/samples/BindingDemo/App.xaml.cs
+++ b/samples/BindingDemo/App.xaml.cs
@@ -3,6 +3,7 @@ using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Logging.Serilog;
 using Avalonia.Markup.Xaml;
+using Avalonia.ReactiveUI;
 using Serilog;
 
 namespace BindingDemo
diff --git a/samples/ControlCatalog.Desktop/Program.cs b/samples/ControlCatalog.Desktop/Program.cs
index dd5644dd6b..b7aa34f5ba 100644
--- a/samples/ControlCatalog.Desktop/Program.cs
+++ b/samples/ControlCatalog.Desktop/Program.cs
@@ -4,6 +4,7 @@ using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Logging.Serilog;
 using Avalonia.Platform;
+using Avalonia.ReactiveUI;
 using Serilog;
 
 namespace ControlCatalog
diff --git a/samples/ControlCatalog.NetCore/Program.cs b/samples/ControlCatalog.NetCore/Program.cs
index d13a5b5ef3..c8f3fb9921 100644
--- a/samples/ControlCatalog.NetCore/Program.cs
+++ b/samples/ControlCatalog.NetCore/Program.cs
@@ -4,6 +4,7 @@ using System.Linq;
 using System.Threading;
 using Avalonia;
 using Avalonia.Skia;
+using Avalonia.ReactiveUI;
 
 namespace ControlCatalog.NetCore
 {
diff --git a/samples/RenderDemo/App.xaml.cs b/samples/RenderDemo/App.xaml.cs
index 0f627961e6..d95018520a 100644
--- a/samples/RenderDemo/App.xaml.cs
+++ b/samples/RenderDemo/App.xaml.cs
@@ -4,6 +4,7 @@
 using Avalonia;
 using Avalonia.Logging.Serilog;
 using Avalonia.Markup.Xaml;
+using Avalonia.ReactiveUI;
 
 namespace RenderDemo
 {
diff --git a/samples/VirtualizationDemo/Program.cs b/samples/VirtualizationDemo/Program.cs
index 98f1f08d6c..9d8f7c1a3d 100644
--- a/samples/VirtualizationDemo/Program.cs
+++ b/samples/VirtualizationDemo/Program.cs
@@ -5,6 +5,7 @@ using System;
 using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Logging.Serilog;
+using Avalonia.ReactiveUI;
 using Serilog;
 
 namespace VirtualizationDemo