diff --git a/include/wx/mac/carbon/private.h b/include/wx/mac/carbon/private.h
index c2e457ffc8..8f9ca83115 100644
--- a/include/wx/mac/carbon/private.h
+++ b/include/wx/mac/carbon/private.h
@@ -444,6 +444,40 @@ private :
 
 #if wxUSE_GUI
 
+class wxMacToolTipTimer ;
+
+class wxMacToolTip
+{
+public :
+    wxMacToolTip() ;
+    ~wxMacToolTip() ;
+
+    void Setup( WindowRef window , const wxString& text , const wxPoint& localPosition ) ;
+    void Draw() ;
+    void Clear() ;
+
+    long GetMark()
+    { return m_mark ; }
+
+    bool IsShown()
+    { return m_shown ; }
+
+private :
+    wxString    m_label ;
+    wxPoint m_position ;
+    Rect            m_rect ;
+    WindowRef    m_window ;
+    PicHandle    m_backpict ;
+    bool        m_shown ;
+    long        m_mark ;
+#if wxUSE_TIMER 
+    wxMacToolTipTimer* m_timer ;
+#endif
+#if TARGET_CARBON
+    wxMacCFStringHolder m_helpTextRef ;
+#endif
+} ;
+
 /*
 GWorldPtr         wxMacCreateGWorld( int width , int height , int depth );
 void                 wxMacDestroyGWorld( GWorldPtr gw );