diff --git a/src/proto/eval.pro b/src/proto/eval.pro
index bc6808c..7d73f6c 100644
--- a/src/proto/eval.pro
+++ b/src/proto/eval.pro
@@ -89,6 +89,7 @@
 char_u *tv_get_string_buf(typval_T *varp, char_u *buf);
 char_u *tv_get_string_chk(typval_T *varp);
 char_u *tv_get_string_buf_chk(typval_T *varp, char_u *buf);
+char_u *tv_stringify(typval_T *varp, char_u *buf);
 dictitem_T *find_var(char_u *name, hashtab_T **htp, int no_autoload);
 dictitem_T *find_var_in_ht(hashtab_T *ht, int htname, char_u *varname, int no_autoload);
 hashtab_T *find_var_ht(char_u *name, char_u **varname);
diff --git a/src/proto/evalfunc.pro b/src/proto/evalfunc.pro
index c79b59c..0986162 100644
--- a/src/proto/evalfunc.pro
+++ b/src/proto/evalfunc.pro
@@ -9,6 +9,7 @@
 void mzscheme_call_vim(char_u *name, typval_T *args, typval_T *rettv);
 float_T vim_round(float_T f);
 long do_searchpair(char_u *spat, char_u *mpat, char_u *epat, int dir, typval_T *skip, int flags, pos_T *match_pos, linenr_T lnum_stop, long time_limit);
+void f_string(typval_T *argvars, typval_T *rettv);
 char_u *get_callback(typval_T *arg, partial_T **pp);
 void free_callback(char_u *callback, partial_T *partial);
 /* vim: set ft=c : */