diff --git a/Source/OpenTK/Platform/Windows/WinGLContext.cs b/Source/OpenTK/Platform/Windows/WinGLContext.cs
index 22aa7ed8..05b77511 100644
--- a/Source/OpenTK/Platform/Windows/WinGLContext.cs
+++ b/Source/OpenTK/Platform/Windows/WinGLContext.cs
@@ -104,6 +104,7 @@ namespace OpenTK.Platform.Windows
                         attributes.Add((int)ArbCreateContext.Flags);
                         attributes.Add((int)flags);
                     }
+                    attributes.Add(0);
 
                     renderContext = new ContextHandle(
                         Wgl.Arb.CreateContextAttribs(