diff --git a/bento-pdf/compose.yaml b/bento-pdf/compose.yaml
index 87c894f..3807c1d 100644
--- a/bento-pdf/compose.yaml
+++ b/bento-pdf/compose.yaml
@@ -13,5 +13,5 @@ services:
       - PUID=1000
       - PGID=1000
       - APP_PORT=8080
-      - SECRET_KEY=${SECRET_KEY}
+      - SECRET_KEY=${SECRET_KEY:?"Secret Key"}
     restart: unless-stopped