diff --git a/src/proto/eval.pro b/src/proto/eval.pro
index 539baa6..f03b28b 100644
--- a/src/proto/eval.pro
+++ b/src/proto/eval.pro
@@ -38,6 +38,7 @@
 void del_menutrans_vars __ARGS((void));
 char_u *get_user_var_name __ARGS((expand_T *xp, int idx));
 int list_append_dict __ARGS((list_T *list, dict_T *dict));
+int garbage_collect __ARGS((void));
 dict_T *dict_alloc __ARGS((void));
 int dict_add_nr_str __ARGS((dict_T *d, char *key, long nr, char_u *str));
 char_u *get_dict_string __ARGS((dict_T *d, char_u *key));