diff --git a/gui-lib/mred/private/wx/gtk/cursor.rkt b/gui-lib/mred/private/wx/gtk/cursor.rkt
index da92895a..661bc2eb 100644
--- a/gui-lib/mred/private/wx/gtk/cursor.rkt
+++ b/gui-lib/mred/private/wx/gtk/cursor.rkt
@@ -36,7 +36,7 @@
                 (cons 'blank void)
                 (cons 'hand GDK_HAND2))))
 
-(define _GdkCursor (_cpointer 'GdkCursor))
+(define _GdkCursor (_cpointer/null 'GdkCursor))
 (define-gdk gdk_cursor_new  (_fun _int -> _GdkCursor))
 (define-gdk gdk_display_get_default (_fun -> _GdkDisplay))
 (define-gdk gdk_cursor_new_from_pixbuf (_fun _GdkDisplay _GdkPixbuf _int _int -> _GdkCursor))