diff --git a/src/OpenTK.GLWidget/OpenTK.GLWidget.csproj b/src/OpenTK.GLWidget/OpenTK.GLWidget.csproj
index 384726f1..245b9696 100644
--- a/src/OpenTK.GLWidget/OpenTK.GLWidget.csproj
+++ b/src/OpenTK.GLWidget/OpenTK.GLWidget.csproj
@@ -144,9 +144,6 @@
     <Compile Include="GLWidget.cs" />
     <Compile Include="Win\WinWindowsInfoInitializer.cs" />
     <Compile Include="X11\GLXAttribute.cs" />
-    <Compile Include="X11\XVisualClass.cs" />
-    <Compile Include="X11\XVisualInfo.cs" />
-    <Compile Include="X11\XVisualInfoMask.cs" />
     <Compile Include="X11\XWindowInfoInitializer.cs" />
   </ItemGroup>
   <ItemGroup>
diff --git a/src/OpenTK.GLWidget/X11/XWindowInfoInitializer.cs b/src/OpenTK.GLWidget/X11/XWindowInfoInitializer.cs
index 21bd3951..0458d8af 100644
--- a/src/OpenTK.GLWidget/X11/XWindowInfoInitializer.cs
+++ b/src/OpenTK.GLWidget/X11/XWindowInfoInitializer.cs
@@ -31,6 +31,7 @@ using System.Runtime.InteropServices;
 using System.Security;
 using OpenTK.Graphics;
 using OpenTK.Platform;
+using OpenTK.Platform.X11;
 
 namespace OpenTK.X11
 {