diff --git a/src/dune_rules/dune_file.ml b/src/dune_rules/dune_file.ml
index a1a11e121f3..33b714fa5ca 100644
--- a/src/dune_rules/dune_file.ml
+++ b/src/dune_rules/dune_file.ml
@@ -1761,50 +1761,6 @@ module Toplevel = struct
   ;;
 end
 
-module Copy_files = struct
-  type t =
-    { add_line_directive : bool
-    ; alias : Alias.Name.t option
-    ; mode : Rule.Mode.t
-    ; enabled_if : Blang.t
-    ; files : String_with_vars.t
-    ; syntax_version : Dune_lang.Syntax.Version.t
-    }
-
-  include Stanza.Make (struct
-      type nonrec t = t
-
-      include Poly
-    end)
-
-  let long_form =
-    let check = Dune_lang.Syntax.since Stanza.syntax (2, 7) in
-    let+ alias = field_o "alias" (check >>> Dune_lang.Alias.decode)
-    and+ mode =
-      field "mode" ~default:Rule.Mode.Standard (check >>> Rule_mode_decoder.decode)
-    and+ enabled_if = Enabled_if.decode ~allowed_vars:Any ~since:(Some (2, 8)) ()
-    and+ files = field "files" (check >>> String_with_vars.decode)
-    and+ syntax_version = Dune_lang.Syntax.get_exn Stanza.syntax in
-    { add_line_directive = false; alias; mode; enabled_if; files; syntax_version }
-  ;;
-
-  let decode =
-    peek_exn
-    >>= function
-    | List _ -> fields long_form
-    | _ ->
-      let+ files = String_with_vars.decode
-      and+ syntax_version = Dune_lang.Syntax.get_exn Stanza.syntax in
-      { add_line_directive = false
-      ; alias = None
-      ; mode = Standard
-      ; enabled_if = Blang.true_
-      ; files
-      ; syntax_version
-      }
-  ;;
-end
-
 module Documentation = struct
   type t =
     { loc : Loc.t
diff --git a/src/dune_rules/dune_file.mli b/src/dune_rules/dune_file.mli
index 7c6741308eb..bbdba644b92 100644
--- a/src/dune_rules/dune_file.mli
+++ b/src/dune_rules/dune_file.mli
@@ -273,19 +273,6 @@ module Executables : sig
   val obj_dir : t -> dir:Path.Build.t -> Path.Build.t Obj_dir.t
 end
 
-module Copy_files : sig
-  type t =
-    { add_line_directive : bool
-    ; alias : Alias.Name.t option
-    ; mode : Rule.Mode.t
-    ; enabled_if : Blang.t
-    ; files : String_with_vars.t
-    ; syntax_version : Dune_lang.Syntax.Version.t
-    }
-
-  include Stanza.S with type t := t
-end
-
 module Documentation : sig
   type t =
     { loc : Loc.t
diff --git a/src/dune_rules/simple_rules.ml b/src/dune_rules/simple_rules.ml
index 5dfd9e5aeea..2ef712bc474 100644
--- a/src/dune_rules/simple_rules.ml
+++ b/src/dune_rules/simple_rules.ml
@@ -155,7 +155,7 @@ let user_rule sctx ?extra_bindings ~dir ~expander (rule : Rule_conf.t) =
        None)
 ;;
 
-let copy_files sctx ~dir ~expander ~src_dir (def : Dune_file.Copy_files.t) =
+let copy_files sctx ~dir ~expander ~src_dir (def : Copy_files.t) =
   let loc = String_with_vars.loc def.files in
   let* glob_in_src =
     let+ src_glob = Expander.No_deps.expand_str expander def.files in
@@ -255,7 +255,7 @@ let copy_files sctx ~dir ~expander ~src_dir (def : Dune_file.Copy_files.t) =
   targets
 ;;
 
-let copy_files sctx ~dir ~expander ~src_dir (def : Dune_file.Copy_files.t) =
+let copy_files sctx ~dir ~expander ~src_dir (def : Copy_files.t) =
   Expander.eval_blang expander def.enabled_if
   >>= function
   | true -> copy_files sctx ~dir ~expander ~src_dir def
diff --git a/src/dune_rules/simple_rules.mli b/src/dune_rules/simple_rules.mli
index 75cec2a8df6..768ead5f469 100644
--- a/src/dune_rules/simple_rules.mli
+++ b/src/dune_rules/simple_rules.mli
@@ -28,7 +28,7 @@ val copy_files
   -> dir:Path.Build.t
   -> expander:Expander.t
   -> src_dir:Path.Source.t
-  -> Dune_file.Copy_files.t
+  -> Copy_files.t
   -> Path.Set.t Memo.t
 
 (** Interpret an [(alias ...)] stanza. *)
diff --git a/src/dune_rules/stanzas/copy_files.ml b/src/dune_rules/stanzas/copy_files.ml
new file mode 100644
index 00000000000..5c3a92167ca
--- /dev/null
+++ b/src/dune_rules/stanzas/copy_files.ml
@@ -0,0 +1,43 @@
+open Import
+open Dune_lang.Decoder
+
+type t =
+  { add_line_directive : bool
+  ; alias : Alias.Name.t option
+  ; mode : Rule.Mode.t
+  ; enabled_if : Blang.t
+  ; files : String_with_vars.t
+  ; syntax_version : Dune_lang.Syntax.Version.t
+  }
+
+include Stanza.Make (struct
+    type nonrec t = t
+
+    include Poly
+  end)
+
+let long_form =
+  let check = Dune_lang.Syntax.since Stanza.syntax (2, 7) in
+  let+ alias = field_o "alias" (check >>> Dune_lang.Alias.decode)
+  and+ mode = field "mode" ~default:Rule.Mode.Standard (check >>> Rule_mode_decoder.decode)
+  and+ enabled_if = Enabled_if.decode ~allowed_vars:Any ~since:(Some (2, 8)) ()
+  and+ files = field "files" (check >>> String_with_vars.decode)
+  and+ syntax_version = Dune_lang.Syntax.get_exn Stanza.syntax in
+  { add_line_directive = false; alias; mode; enabled_if; files; syntax_version }
+;;
+
+let decode =
+  peek_exn
+  >>= function
+  | List _ -> fields long_form
+  | _ ->
+    let+ files = String_with_vars.decode
+    and+ syntax_version = Dune_lang.Syntax.get_exn Stanza.syntax in
+    { add_line_directive = false
+    ; alias = None
+    ; mode = Standard
+    ; enabled_if = Blang.true_
+    ; files
+    ; syntax_version
+    }
+;;
diff --git a/src/dune_rules/stanzas/copy_files.mli b/src/dune_rules/stanzas/copy_files.mli
new file mode 100644
index 00000000000..1702735a099
--- /dev/null
+++ b/src/dune_rules/stanzas/copy_files.mli
@@ -0,0 +1,14 @@
+open Import
+
+type t =
+  { add_line_directive : bool
+  ; alias : Alias.Name.t option
+  ; mode : Rule.Mode.t
+  ; enabled_if : Blang.t
+  ; files : String_with_vars.t
+  ; syntax_version : Dune_lang.Syntax.Version.t
+  }
+
+include Stanza.S with type t := t
+
+val decode : t Dune_lang.Decoder.t