diff --git a/src/proto/eval.pro b/src/proto/eval.pro
index 8be5885..49dc65b 100644
--- a/src/proto/eval.pro
+++ b/src/proto/eval.pro
@@ -42,6 +42,7 @@
 void eval_addblob(typval_T *tv1, typval_T *tv2);
 int eval_addlist(typval_T *tv1, typval_T *tv2);
 int eval_leader(char_u **arg, int vim9);
+int handle_predefined(char_u *s, int len, typval_T *rettv);
 int check_can_index(typval_T *rettv, int evaluate, int verbose);
 void f_slice(typval_T *argvars, typval_T *rettv);
 int eval_index_inner(typval_T *rettv, int is_range, typval_T *var1, typval_T *var2, int exclusive, char_u *key, int keylen, int verbose);