diff --git a/.gitea/workflows/test.yml b/.gitea/workflows/test.yml
index d705777..433d880 100644
--- a/.gitea/workflows/test.yml
+++ b/.gitea/workflows/test.yml
@@ -225,7 +225,7 @@ jobs:
       # `diff_coverage.py` need only `coverage` (not pylint/pyright).
       - name: Combined coverage (unit + integration, incl. firecracker)
         env:
-          BOT_BOTTLE_INFRA_ARTIFACT_DIR: ${{ github.workspace }}/infra-candidate
+          BOT_BOTTLE_CI_INFRA_ARTIFACT_DIR: ${{ github.workspace }}/infra-candidate
         run: PYTHON=python3 bash scripts/coverage.sh critical
 
       - name: Diff-coverage gate (changed lines >= 90%)
diff --git a/scripts/coverage.sh b/scripts/coverage.sh
index 0665a69..33a3e2f 100755
--- a/scripts/coverage.sh
+++ b/scripts/coverage.sh
@@ -28,6 +28,7 @@ echo "== unit ==" >&2
 
 echo "== integration (firecracker; skips docker tests) ==" >&2
 BOT_BOTTLE_BACKEND=firecracker SKIP_DOCKER_TESTS=1 \
+    BOT_BOTTLE_INFRA_ARTIFACT_DIR="${BOT_BOTTLE_CI_INFRA_ARTIFACT_DIR:-}" \
     "$PY" -m coverage run --append -m unittest discover -t . -s tests/integration
 
 echo "== combined report ==" >&2