diff --git a/generator/bindtests.ml b/generator/bindtests.ml
index a4dc72555..183fa9e0c 100644
--- a/generator/bindtests.ml
+++ b/generator/bindtests.ml
@@ -985,7 +985,7 @@ and generate_php_bindtests () =
 
 and generate_rust_bindtests () =
   let copyrights = ["Hiroyuki Katsura <hiroyuki.katsura.0513@gmail.com>"] in
-  generate_header ~copyrights:copyrights CStyle GPLv2plus;
+  generate_header ~copyrights CStyle GPLv2plus;
 
   pr "extern crate guestfs;\n";
   pr "use guestfs::*;\n";
diff --git a/generator/rust.ml b/generator/rust.ml
index a3f1627f5..a1735602c 100644
--- a/generator/rust.ml
+++ b/generator/rust.ml
@@ -53,7 +53,7 @@ let translate_bad_symbols s =
     s
 
 let generate_rust () =
-  generate_header ~copyrights:copyrights CStyle LGPLv2plus;
+  generate_header ~copyrights CStyle LGPLv2plus;
 
   pr "
 use crate::base::*;