diff --git a/src/proto/vim9compile.pro b/src/proto/vim9compile.pro
new file mode 100644
index 0000000..4f06e9d
--- /dev/null
+++ b/src/proto/vim9compile.pro
@@ -0,0 +1,14 @@
+/* vim9compile.c */
+char_u *skip_type(char_u *start);
+type_T *parse_type(char_u **arg, garray_T *type_list);
+char *vartype_name(vartype_T type);
+char *type_name(type_T *type, char **tofree);
+int get_script_item_idx(int sid, char_u *name, int check_writable);
+imported_T *find_imported(char_u *name, cctx_T *cctx);
+char_u *to_name_end(char_u *arg);
+char_u *to_name_const_end(char_u *arg);
+int assignment_len(char_u *p, int *heredoc);
+void compile_def_function(ufunc_T *ufunc, int set_return_type);
+void delete_def_function(ufunc_T *ufunc);
+void free_def_functions(void);
+/* vim: set ft=c : */