1 files changed, 2 insertions, 1 deletions
diff --git a/FL/mac.H b/FL/mac.H
index 8da33239d..7de2b2008 100644
--- a/FL/mac.H
+++ b/FL/mac.H
@@ -139,8 +139,9 @@ extern NSCursor *fl_default_cursor;
 
 // This object contains all mac-specific stuff about a window:
 // WARNING: this object is highly subject to change!
-class Fl_X : public Fl_Device {
+class Fl_X {
 public:
+  virtual ~Fl_X() {}       // very important
   Window xid;              // pointer to the Cocoa window object (FLWindow*)
   Fl_Offscreen other_xid;  // pointer for offscreen bitmaps (overlay window)
   Fl_Window *w;            // FLTK window for