diff --git a/src/proto/charset.pro b/src/proto/charset.pro
index e839d63..9fae406 100644
--- a/src/proto/charset.pro
+++ b/src/proto/charset.pro
@@ -40,6 +40,7 @@
 void getvcols __ARGS((win_T *wp, pos_T *pos1, pos_T *pos2, colnr_T *left, colnr_T *right));
 char_u *skipwhite __ARGS((char_u *p));
 char_u *skipdigits __ARGS((char_u *p));
+char_u *skiphex __ARGS((char_u *p));
 char_u *skiptodigit __ARGS((char_u *p));
 char_u *skiptohex __ARGS((char_u *p));
 int vim_isdigit __ARGS((int c));