diff --git a/setup/mail-postfix.sh b/setup/mail-postfix.sh
index 6a7bbad6..7a5960d8 100755
--- a/setup/mail-postfix.sh
+++ b/setup/mail-postfix.sh
@@ -285,7 +285,7 @@ zones:
 EOF
 
 # add postfix configuration
-tools/editconf.py /etc/postfix/main.cf -s \
+tools/editconf.py /etc/postfix/main.cf \
 	smtp_tls_policy_maps=socketmap:inet:127.0.0.1:8461:postfix
 
 # enable and start the MTA-STS service