diff --git a/src/proto/evalfunc.pro b/src/proto/evalfunc.pro
index 5103588..da1c324 100644
--- a/src/proto/evalfunc.pro
+++ b/src/proto/evalfunc.pro
@@ -1,4 +1,5 @@
 /* evalfunc.c */
+int arg_type_modifiable(type_T *type, int arg_idx);
 char_u *get_function_name(expand_T *xp, int idx);
 char_u *get_expr_name(expand_T *xp, int idx);
 int find_internal_func(char_u *name);
diff --git a/src/proto/vim9type.pro b/src/proto/vim9type.pro
index aaa1a71..68bb8fa 100644
--- a/src/proto/vim9type.pro
+++ b/src/proto/vim9type.pro
@@ -1,4 +1,5 @@
 /* vim9type.c */
+type_T *copy_type(type_T *type, garray_T *type_gap);
 void clear_type_list(garray_T *gap);
 type_T *alloc_type(type_T *type);
 void free_type(type_T *type);