diff --git a/src/proto/vim9execute.pro b/src/proto/vim9execute.pro
index 4f7262d..578fe81 100644
--- a/src/proto/vim9execute.pro
+++ b/src/proto/vim9execute.pro
@@ -1,6 +1,7 @@
 /* vim9execute.c */
-int call_def_function(ufunc_T *ufunc, int argc, typval_T *argv, typval_T *rettv);
+int call_def_function(ufunc_T *ufunc, int argc_arg, typval_T *argv, typval_T *rettv);
 void ex_disassemble(exarg_T *eap);
 int tv2bool(typval_T *tv);
 int check_not_string(typval_T *tv);
+int set_ref_in_dfunc(ufunc_T *ufunc, int copyID);
 /* vim: set ft=c : */