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-rw-r--r--nixos/tests/nar-serve.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixos/tests/nar-serve.nix b/nixos/tests/nar-serve.nix
index 9ee738ffb17..bb95ccb3691 100644
--- a/nixos/tests/nar-serve.nix
+++ b/nixos/tests/nar-serve.nix
@@ -31,7 +31,7 @@ import ./make-test-python.nix (
 
       # Create a fake cache with Nginx service the static files
       server.succeed(
-          "nix copy --to file:///var/www ${pkgs.hello}"
+          "nix --experimental-features nix-command copy --to file:///var/www ${pkgs.hello}"
       )
       server.wait_for_unit("nginx.service")
       server.wait_for_open_port(80)