diff --git a/nix/gitlab-ci/default.nix b/nix/gitlab-ci/default.nix
index 04d9181398..7dc4b4023c 100644
--- a/nix/gitlab-ci/default.nix
+++ b/nix/gitlab-ci/default.nix
@@ -38,7 +38,7 @@ let
       image = "nixos/nix:latest";
       needs = [{ job = "nixCache-linux-eval"; artifacts = true; }];
       script = [
-        "nix-store --realise $(cat drv-name) --option substituters \"https://cache.nixos.org/ s3://lukegb-nix-cache?endpoint=storage.googleapis.com&trusted=1\""
+        "nix-store --realise $(cat drv-name) --option substituters \"https://cache.nixos.org/ s3://lukegb-nix-cache?endpoint=storage.googleapis.com&trusted=1\" --indirect --add-root ./result"
         "readlink -f ./result"
         "nix run -f ./ go.nix.bcacheup -c bcacheup --cache_url vaultgs://lukegb-nix-cache --vault_addr unix:///run/tokend/sock --vault_token_source gcp/roleset/binary-cache-deployer/token ./result"
         "cat ./result/combined-systems > systems.json"