diff --git a/buildbot_nix/__init__.py b/buildbot_nix/__init__.py
index 06474f5..3ed6178 100644
--- a/buildbot_nix/__init__.py
+++ b/buildbot_nix/__init__.py
@@ -628,9 +628,9 @@ def nix_build_config(
             command=[
                 "nix",
                 "copy",
+                "--derivation",
                 "--to",
                 "../store",
-                "--no-check-sigs",
                 util.Interpolate("%(prop:drv_path)s^*")
             ]
         )