diff --git a/src/proto/vim9script.pro b/src/proto/vim9script.pro
index 5b83f12..8f9cb6d 100644
--- a/src/proto/vim9script.pro
+++ b/src/proto/vim9script.pro
@@ -9,7 +9,7 @@
 char_u *handle_import(char_u *arg_start, garray_T *gap, int import_sid, evalarg_T *evalarg, void *cctx);
 char_u *vim9_declare_scriptvar(exarg_T *eap, char_u *arg);
 void add_vim9_script_var(dictitem_T *di, typval_T *tv, type_T *type);
-void hide_script_var(scriptitem_T *si, int idx);
+void hide_script_var(scriptitem_T *si, int idx, int func_defined);
 void free_all_script_vars(scriptitem_T *si);
 svar_T *find_typval_in_script(typval_T *dest);
 int check_script_var_type(typval_T *dest, typval_T *value, char_u *name);