diff --git a/docker-compose.yml b/docker-compose.yml
index 79ac6ad..c7a3e0a 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -36,7 +36,7 @@ services:
       NOTIFICATIONS_SMTP_SENDER: "${SMTP_SENDER:-OpenCloud Notifications <notifications@cloud.opencloud.test>}"
       NOTIFICATIONS_SMTP_USERNAME: "${SMTP_USERNAME}"
       NOTIFICATIONS_SMTP_PASSWORD: "${SMTP_PASSWORD}"
-      NOTIFICATIONS_SMTP_INSECURE: "${SMTP_INSECURE}"
+      NOTIFICATIONS_SMTP_INSECURE: "${SMTP_INSECURE:-false}"
       NOTIFICATIONS_SMTP_AUTHENTICATION: "${SMTP_AUTHENTICATION}"
       NOTIFICATIONS_SMTP_ENCRYPTION: "${SMTP_TRANSPORT_ENCRYPTION:-none}"
       FRONTEND_ARCHIVER_MAX_SIZE: "10000000000"