diff --git a/target/scripts/start-mailserver.sh b/target/scripts/start-mailserver.sh
index a729915d..307e9ffa 100755
--- a/target/scripts/start-mailserver.sh
+++ b/target/scripts/start-mailserver.sh
@@ -40,7 +40,7 @@ SPAMASSASSIN_SPAM_TO_INBOX_IS_SET="$( if [[ -n ${SPAMASSASSIN_SPAM_TO_INBOX+'set
 SPAMASSASSIN_SPAM_TO_INBOX="${SPAMASSASSIN_SPAM_TO_INBOX:=0}"
 SPOOF_PROTECTION="${SPOOF_PROTECTION:=0}"
 SRS_SENDER_CLASSES="${SRS_SENDER_CLASSES:=envelope_sender}"
-SSL_TYPE="${SSL_TYPE:=''}"
+SSL_TYPE="${SSL_TYPE:=}"
 SUPERVISOR_LOGLEVEL="${SUPERVISOR_LOGLEVEL:=warn}"
 TLS_LEVEL="${TLS_LEVEL:=modern}"
 VIRUSMAILS_DELETE_DELAY="${VIRUSMAILS_DELETE_DELAY:=7}"