diff --git a/src/ast_412.ml b/src/ast_412.ml
index 6b4f63f3..09a07379 100644
--- a/src/ast_412.ml
+++ b/src/ast_412.ml
@@ -1016,6 +1016,6 @@ module Parsetree = struct
 end
 
 module Config = struct
-  let ast_impl_magic_number = "Caml1999M027"
-  let ast_intf_magic_number = "Caml1999N027"
+  let ast_impl_magic_number = "Caml1999M029"
+  let ast_intf_magic_number = "Caml1999N029"
 end