diff --git a/Source/OpenTK/NativeWindow.cs b/Source/OpenTK/NativeWindow.cs
index 81af9e58..795b67ef 100644
--- a/Source/OpenTK/NativeWindow.cs
+++ b/Source/OpenTK/NativeWindow.cs
@@ -275,8 +275,9 @@ namespace OpenTK
             {
                 EnsureUndisposed();
                 if (value == null)
-                    throw new ArgumentNullException();
-
+                {
+                    value = MouseCursor.Empty;
+                }
                 implementation.Cursor = value;
             }
         }