diff --git a/src/proto/eval.pro b/src/proto/eval.pro
index 7c0ca84..0b76ff6 100644
--- a/src/proto/eval.pro
+++ b/src/proto/eval.pro
@@ -61,6 +61,7 @@
 char_u *v_exception __ARGS((char_u *oldval));
 char_u *v_throwpoint __ARGS((char_u *oldval));
 char_u *set_cmdarg __ARGS((exarg_T *eap, char_u *oldarg));
+void free_tv __ARGS((typval_T *varp));
 void clear_tv __ARGS((typval_T *varp));
 long get_tv_number_chk __ARGS((typval_T *varp, int *denote));
 char_u *get_tv_string_chk __ARGS((typval_T *varp));