diff --git a/samples/PlatformSanityChecks/PlatformSanityChecks.csproj b/samples/PlatformSanityChecks/PlatformSanityChecks.csproj
index 5c743aabdb..5f61a08f3c 100644
--- a/samples/PlatformSanityChecks/PlatformSanityChecks.csproj
+++ b/samples/PlatformSanityChecks/PlatformSanityChecks.csproj
@@ -11,4 +11,5 @@
     <ProjectReference Include="..\..\src\Avalonia.X11\Avalonia.X11.csproj" />
   </ItemGroup>
 
+  <Import Project="..\..\build\Rx.props" />
 </Project>
diff --git a/samples/Previewer/Previewer.csproj b/samples/Previewer/Previewer.csproj
index 2cc84168dc..76c1ba7b69 100644
--- a/samples/Previewer/Previewer.csproj
+++ b/samples/Previewer/Previewer.csproj
@@ -12,7 +12,8 @@
   <ItemGroup>
     <ProjectReference Include="..\..\src\Avalonia.Themes.Simple\Avalonia.Themes.Simple.csproj" />
   </ItemGroup>
-  
+
+  <Import Project="..\..\build\Rx.props" />
   <Import Project="..\..\build\SampleApp.props" />
   <Import Project="..\..\build\ReferenceCoreLibraries.props" />
 </Project>
diff --git a/src/Avalonia.Base/Avalonia.Base.csproj b/src/Avalonia.Base/Avalonia.Base.csproj
index d40fe1e6f8..e6c13d251f 100644
--- a/src/Avalonia.Base/Avalonia.Base.csproj
+++ b/src/Avalonia.Base/Avalonia.Base.csproj
@@ -38,6 +38,7 @@
     <InternalsVisibleTo Include="Avalonia.Native, PublicKey=$(AvaloniaPublicKey)" />
     <InternalsVisibleTo Include="Avalonia.FreeDesktop, PublicKey=$(AvaloniaPublicKey)" />
     <InternalsVisibleTo Include="Avalonia.X11, PublicKey=$(AvaloniaPublicKey)" />
+    <InternalsVisibleTo Include="Avalonia.Browser, PublicKey=$(AvaloniaPublicKey)" />
     <InternalsVisibleTo Include="Avalonia.OpenGL, PublicKey=$(AvaloniaPublicKey)" />
     <InternalsVisibleTo Include="Avalonia.Skia, PublicKey=$(AvaloniaPublicKey)" />
     <InternalsVisibleTo Include="Avalonia.Controls.UnitTests, PublicKey=$(AvaloniaPublicKey)" />
diff --git a/src/Browser/Avalonia.Browser/Skia/BrowserSkiaGpu.cs b/src/Browser/Avalonia.Browser/Skia/BrowserSkiaGpu.cs
index e56efdb4a8..4d3d8dcd97 100644
--- a/src/Browser/Avalonia.Browser/Skia/BrowserSkiaGpu.cs
+++ b/src/Browser/Avalonia.Browser/Skia/BrowserSkiaGpu.cs
@@ -1,8 +1,8 @@
 using System;
 using System.Collections.Generic;
-using System.Reactive.Disposables;
 using Avalonia.Platform;
 using Avalonia.Skia;
+using Avalonia.Reactive;
 
 namespace Avalonia.Browser.Skia
 {