diff --git a/src/proto/os_mswin.pro b/src/proto/os_mswin.pro
index aaef05b..f46a3f8 100644
--- a/src/proto/os_mswin.pro
+++ b/src/proto/os_mswin.pro
@@ -46,8 +46,8 @@
 extern void mch_print_start_line __ARGS((int margin, int page_line));
 extern int mch_print_text_out __ARGS((char_u *p, int len));
 extern void mch_print_set_font __ARGS((int iBold, int iItalic, int iUnderline));
-extern void mch_print_set_bg __ARGS((unsigned long bgcol));
-extern void mch_print_set_fg __ARGS((unsigned long fgcol));
+extern void mch_print_set_bg __ARGS((long_u bgcol));
+extern void mch_print_set_fg __ARGS((long_u fgcol));
 extern char_u *mch_resolve_shortcut __ARGS((char_u *fname));
 extern void win32_set_foreground __ARGS((void));
 extern void serverInitMessaging __ARGS((void));