diff --git a/calculate-buildkite-steps.py b/calculate-buildkite-steps.py
index ebe712ade..92bf39ee1 100755
--- a/calculate-buildkite-steps.py
+++ b/calculate-buildkite-steps.py
@@ -116,7 +116,11 @@ try:
             'group': group,
             'steps': [
                 {
-                    'command': f'nix build --no-link -L ".#hydraJobs.{job.name}"',
+                    'command': textwrap.dedent(f'''
+                        set -ueo pipefail
+                        resultPath=$(nix build --print-out-paths --no-link -L ".#hydraJobs.{job.name}")
+                        attic push afnix-ci $$resultPath || true
+                    '''),
                     'label': ".".join(job.path),
                     'key': job.drv_hash(),
                     'depends_on': [ d.drv_hash() for d in deps[job] ],