diff --git a/pkgs/by-name/ni/nixos-rebuild-ng/src/nixos_rebuild/nix.py b/pkgs/by-name/ni/nixos-rebuild-ng/src/nixos_rebuild/nix.py
index acc9448fec00..0d8abca0f92d 100644
--- a/pkgs/by-name/ni/nixos-rebuild-ng/src/nixos_rebuild/nix.py
+++ b/pkgs/by-name/ni/nixos-rebuild-ng/src/nixos_rebuild/nix.py
@@ -210,6 +210,7 @@ def copy_closure(
         run_wrapper(
             [
                 "nix",
+                *FLAKE_FLAGS,
                 "copy",
                 *dict_to_flags(copy_flags),
                 "--from",
diff --git a/pkgs/by-name/ni/nixos-rebuild-ng/src/tests/test_main.py b/pkgs/by-name/ni/nixos-rebuild-ng/src/tests/test_main.py
index 504d016bbfbb..e3678420bc14 100644
--- a/pkgs/by-name/ni/nixos-rebuild-ng/src/tests/test_main.py
+++ b/pkgs/by-name/ni/nixos-rebuild-ng/src/tests/test_main.py
@@ -688,6 +688,8 @@ def test_execute_nix_switch_build_target_host(
             call(
                 [
                     "nix",
+                    "--extra-experimental-features",
+                    "nix-command flakes",
                     "copy",
                     "--from",
                     "ssh://user@build-host",
diff --git a/pkgs/by-name/ni/nixos-rebuild-ng/src/tests/test_nix.py b/pkgs/by-name/ni/nixos-rebuild-ng/src/tests/test_nix.py
index 05cb69e69d8b..1bca16260012 100644
--- a/pkgs/by-name/ni/nixos-rebuild-ng/src/tests/test_nix.py
+++ b/pkgs/by-name/ni/nixos-rebuild-ng/src/tests/test_nix.py
@@ -263,6 +263,8 @@ def test_copy_closure(monkeypatch: MonkeyPatch) -> None:
         mock_run.assert_called_with(
             [
                 "nix",
+                "--extra-experimental-features",
+                "nix-command flakes",
                 "copy",
                 "--copy-flag",
                 "--from",