diff --git a/gitea/docker-compose.yml b/gitea/docker-compose.yml
index aa32ec3..04935c6 100644
--- a/gitea/docker-compose.yml
+++ b/gitea/docker-compose.yml
@@ -18,8 +18,8 @@ services:
       - GITEA__database__PASSWD=gitea
       - GITEA__mailer__ENABLED=true
       - GITEA__mailer__FROM=${GITEA__mailer__FROM}
-      - GITEA__mailer__SMTP_PORT=${GITEA__mailer__SMTP_PORT:587}
-      - GITEA__mailer__PROTOCOL=${GITEA__mailer__PROTOCOL:smtp+starttls}
+      - GITEA__mailer__SMTP_PORT=${GITEA__mailer__SMTP_PORT:-587}
+      - GITEA__mailer__PROTOCOL=${GITEA__mailer__PROTOCOL:-smtp+starttls}
       - GITEA__mailer__SMTP_ADDR=${GITEA__mailer__SMTP_ADDR}
       - GITEA__mailer__USER=${GITEA__mailer__USER}
       - GITEA__mailer__PASSWD=${GITEA__mailer__PASSWD}