diff --git a/.buildkite/pipeline-raw.yml b/.buildkite/pipeline-raw.yml
index 2405f10f..98a9b22f 100644
--- a/.buildkite/pipeline-raw.yml
+++ b/.buildkite/pipeline-raw.yml
@@ -186,7 +186,7 @@ steps:
    commands:
     - buildkite-agent artifact download "out/*~focal_amd64.deb" . --step build-static-deb
     - cd tests/systemd
-    - nix shell ../..#legacyPackages.x86_64-linux.vagrant ../..#legacyPackages.x86_64-linux.curl -c vagrant --packages-directory=../../out up --provider=libvirt
+    - NIXPKGS_ALLOW_UNFREE=1 nix shell --impure ../..#legacyPackages.x86_64-linux.vagrant ../..#legacyPackages.x86_64-linux.curl -c vagrant --packages-directory=../../out up --provider=libvirt
    retry:
      automatic:
        limit: 3