diff --git a/ncurses/win32con/wcwidth.c b/ncurses/win32con/wcwidth.c
index cdef64a..5584366 100644
--- a/ncurses/win32con/wcwidth.c
+++ b/ncurses/win32con/wcwidth.c
@@ -1,5 +1,6 @@
 /****************************************************************************
- * Copyright (c) 2010 Free Software Foundation, Inc.                        *
+ * Copyright 2020 Thomas E. Dickey                                          *
+ * Copyright 2010 Free Software Foundation, Inc.                            *
  *                                                                          *
  * Permission is hereby granted, free of charge, to any person obtaining a  *
  * copy of this software and associated documentation files (the            *
@@ -27,7 +28,7 @@
  ****************************************************************************/
 #include <curses.priv.h>
 
-MODULE_ID("$Id: wcwidth.c,v 1.2 2010/08/07 20:52:43 tom Exp $")
+MODULE_ID("$Id: wcwidth.c,v 1.4 2020/07/11 21:02:10 tom Exp $")
 
 #if USE_WIDEC_SUPPORT
 #define mk_wcwidth(ucs)          _nc_wcwidth(ucs)
@@ -35,10 +36,10 @@
 #define mk_wcwidth_cjk(ucs)      _nc_wcwidth_cjk(ucs)
 #define mk_wcswidth_cjk(pwcs, n) _nc_wcswidth_cjk(pwcs, n)
 
-extern int mk_wcwidth(wchar_t);
-extern int mk_wcswidth(const wchar_t *, size_t);
-extern int mk_wcwidth_cjk(wchar_t);
-extern int mk_wcswidth_cjk(const wchar_t *, size_t);
+NCURSES_EXPORT(int) mk_wcwidth(wchar_t);
+NCURSES_EXPORT(int) mk_wcswidth(const wchar_t *, size_t);
+NCURSES_EXPORT(int) mk_wcwidth_cjk(wchar_t);
+NCURSES_EXPORT(int) mk_wcswidth_cjk(const wchar_t *, size_t);
 
 #include <wcwidth.h>
 #else