diff --git a/.github/workflows/drift-to-issue.yml b/.github/workflows/drift-to-issue.yml
index 5d6bd13..4a1b33a 100644
--- a/.github/workflows/drift-to-issue.yml
+++ b/.github/workflows/drift-to-issue.yml
@@ -43,10 +43,10 @@ jobs:
           # For each failed job, ensure a single open tracking issue
           # exists. Title format `[harness-drift] <job name>` makes
           # updates idempotent.
-          echo "$jobs_json" | python3 - <<'PY'
-          import json, os, subprocess, sys
+          JOBS_JSON="$jobs_json" python3 - <<'PY'
+          import json, os, subprocess
 
-          jobs = json.loads(sys.stdin.read())["jobs"]
+          jobs = json.loads(os.environ["JOBS_JSON"])["jobs"]
           run_url = os.environ["RUN_URL"]
 
           for job in jobs: