diff --git a/Source/OpenTK/Graphics/OpenGL/GLHelper.cs b/Source/OpenTK/Graphics/OpenGL/GLHelper.cs
index 808d3829..120bc3a7 100644
--- a/Source/OpenTK/Graphics/OpenGL/GLHelper.cs
+++ b/Source/OpenTK/Graphics/OpenGL/GLHelper.cs
@@ -75,7 +75,6 @@ namespace OpenTK.Graphics.OpenGL
 
         internal const string Library = "opengl32.dll";
 
-        static SortedList<string, bool> AvailableExtensions = new SortedList<string, bool>();
         static readonly object sync_root = new object();
 
         static IntPtr[] EntryPoints;