diff --git a/Source/OpenTK/Platform/Windows/WinGLNative.cs b/Source/OpenTK/Platform/Windows/WinGLNative.cs
index ba25740e..4110b6eb 100644
--- a/Source/OpenTK/Platform/Windows/WinGLNative.cs
+++ b/Source/OpenTK/Platform/Windows/WinGLNative.cs
@@ -431,6 +431,9 @@ namespace OpenTK.Platform.Windows
                     }
                     break;
 
+                case WindowMessage.SYSCHAR:
+                    return IntPtr.Zero;
+
                 case WindowMessage.KILLFOCUS:
                     keyboard.ClearKeys();
                     break;