diff --git a/src/proto/eval.pro b/src/proto/eval.pro
index 9fda13c..60fad80 100644
--- a/src/proto/eval.pro
+++ b/src/proto/eval.pro
@@ -150,4 +150,5 @@
 void reset_v_option_vars(void);
 int modify_fname(char_u *src, int *usedlen, char_u **fnamep, char_u **bufp, int *fnamelen);
 char_u *do_string_sub(char_u *str, char_u *pat, char_u *sub, char_u *flags);
+char_u *tv2string(typval_T *tv, char_u **tofree, char_u *numbuf, int copyID);
 /* vim: set ft=c : */