diff --git a/src/proto/eval.pro b/src/proto/eval.pro
index 8fa908c..ec45364 100644
--- a/src/proto/eval.pro
+++ b/src/proto/eval.pro
@@ -39,6 +39,7 @@
 int eval1(char_u **arg, typval_T *rettv, evalarg_T *evalarg);
 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 check_can_index(typval_T *rettv, int evaluate, int verbose);
 int eval_index_inner(typval_T *rettv, int is_range, typval_T *var1, typval_T *var2, char_u *key, int keylen, int verbose);
 char_u *partial_name(partial_T *pt);