diff --git a/Source/OpenTK/Graphics/GraphicsMode.cs b/Source/OpenTK/Graphics/GraphicsMode.cs
index 01262ad6..1068f833 100644
--- a/Source/OpenTK/Graphics/GraphicsMode.cs
+++ b/Source/OpenTK/Graphics/GraphicsMode.cs
@@ -22,7 +22,6 @@ namespace OpenTK.Graphics
         IntPtr? index = null;  // The id of the pixel format or visual.
 
         static GraphicsMode defaultMode;
-        static IGraphicsMode implementation;
         static readonly object SyncRoot = new object();
 
         #region Constructors