diff --git a/src/proto/vim9compile.pro b/src/proto/vim9compile.pro
index 881dddc..bdefb4e 100644
--- a/src/proto/vim9compile.pro
+++ b/src/proto/vim9compile.pro
@@ -11,6 +11,7 @@
 char_u *next_line_from_context(cctx_T *cctx, int skip_comment);
 char_u *to_name_end(char_u *arg, int use_namespace);
 char_u *to_name_const_end(char_u *arg);
+int get_lambda_tv_and_compile(char_u **arg, typval_T *rettv, int types_optional, evalarg_T *evalarg);
 exprtype_T get_compare_type(char_u *p, int *len, int *type_is);
 void error_white_both(char_u *op, int len);
 void fill_exarg_from_cctx(exarg_T *eap, cctx_T *cctx);