diff --git a/include/wx/mac/msgdlg.h b/include/wx/mac/msgdlg.h
index 58fa8e51ae..7fff51a61a 100644
--- a/include/wx/mac/msgdlg.h
+++ b/include/wx/mac/msgdlg.h
@@ -41,10 +41,5 @@ public:
     int ShowModal();
 };
 
-
-int WXDLLEXPORT wxMessageBox(const wxString& message, const wxString& caption = wxMessageBoxCaptionStr,
-  long style = wxOK|wxCENTRE,
-  wxWindow *parent = NULL, int x = -1, int y = -1);
-
 #endif
     // _WX_MSGBOXDLG_H_