diff --git a/.forgejo/workflows/build_nixos_configs.yml b/.forgejo/workflows/build_nixos_configs.yml
index 2d4c943..7ea9544 100644
--- a/.forgejo/workflows/build_nixos_configs.yml
+++ b/.forgejo/workflows/build_nixos_configs.yml
@@ -23,5 +23,7 @@ jobs:
           nix build .#nixosConfigurations.${{ matrix.system }}.config.system.build.toplevel
       - name: Push build to attic
         run: |
-          nix run nixpkgs#attic-client -- login gospel https://attic.kilonull.com ${{ secrets.ATTIC_PUSH_SECRET }}
-          nix run nixpkgs#attic-client -- push gospel:nixosConfigs ./result
+          nix --extra-experimental-features nix-command run nixpkgs#attic-client \
+            -- login gospel https://attic.kilonull.com ${{ secrets.ATTIC_PUSH_SECRET }}
+          nix --extra-experimental-features nix-command run nixpkgs#attic-client \
+            -- push gospel:nixosConfigs ./result