diff --git a/.github/workflows/preflight_cleanup.yml b/.github/workflows/preflight_cleanup.yml
index 1646311abc..e931664bce 100644
--- a/.github/workflows/preflight_cleanup.yml
+++ b/.github/workflows/preflight_cleanup.yml
@@ -36,7 +36,7 @@ jobs:
         uses: slackapi/slack-github-action@485a9d42d3a73031f12ec201c457e2162c45d02d
         env:
           SLACK_WEBHOOK_URL: ${{ secrets.PREFLIGHT_SLACK_WEBHOOK_URL }}
-          SLACK_WEBHOOK_TYPE: INCOMING_WEBHOOK
+          SLACK_WEBHOOK_TYPE: incoming-webhook
         with:
           payload: |
             {