diff --git a/ops/staging-deploy.tmpl.yaml b/ops/staging-deploy.tmpl.yaml
index ae243c2..9a18e24 100644
--- a/ops/staging-deploy.tmpl.yaml
+++ b/ops/staging-deploy.tmpl.yaml
@@ -73,7 +73,7 @@ env:
     DATABASE_USER: archives-online
     MYSQL_ROOT_PASSWORD: $MYSQL_ROOT_PASSWORD
     PASSENGER_APP_ENV: production
-    SECRET_KEY:
+    SECRET_KEY: $SECRET_KEY
     SOLR_ADMIN_PASSWORD: $SOLR_ADMIN_PASSWORD
     SOLR_ADMIN_USER: admin
     SOLR_COLLECTION_NAME: archives-online