diff --git a/.github/workflows/preview_on_auspice_us.yaml b/.github/workflows/preview_on_auspice_us.yaml
index 891dfaa7c..372e523d7 100644
--- a/.github/workflows/preview_on_auspice_us.yaml
+++ b/.github/workflows/preview_on_auspice_us.yaml
@@ -18,4 +18,4 @@ jobs:
     secrets: inherit
     with:
       repository: nextstrain/auspice.us
-      cleanup: github.event.action == 'closed'
+      cleanup: ${{ github.event.action == 'closed' }}
diff --git a/.github/workflows/preview_on_nextstrain_org.yaml b/.github/workflows/preview_on_nextstrain_org.yaml
index 9379a32cb..f73ff71c4 100644
--- a/.github/workflows/preview_on_nextstrain_org.yaml
+++ b/.github/workflows/preview_on_nextstrain_org.yaml
@@ -19,4 +19,4 @@ jobs:
     with:
       repository: nextstrain/nextstrain.org
       directory: auspice-client
-      cleanup: github.event.action == 'closed'
+      cleanup: ${{ github.event.action == 'closed' }}