diff --git a/src/proto/misc2.pro b/src/proto/misc2.pro
index 365f2ea..38d50a9 100644
--- a/src/proto/misc2.pro
+++ b/src/proto/misc2.pro
@@ -31,6 +31,7 @@
 char_u *vim_strsave_up __ARGS((char_u *string));
 char_u *vim_strnsave_up __ARGS((char_u *string, int len));
 void vim_strup __ARGS((char_u *p));
+char_u *strup_save __ARGS((char_u *orig));
 void copy_spaces __ARGS((char_u *ptr, size_t count));
 void copy_chars __ARGS((char_u *ptr, size_t count, int c));
 void del_trailing_spaces __ARGS((char_u *ptr));