diff --git a/update.sh b/update.sh
index d879f593..02c6e8b3 100755
--- a/update.sh
+++ b/update.sh
@@ -135,6 +135,7 @@ CONFIG_ARRAY=(
   "API_KEY"
   "API_ALLOW_FROM"
   "MAILDIR_GC_TIME"
+  "MAILDIR_SUB"
   "ACL_ANYONE"
   "SOLR_HEAP"
   "SKIP_SOLR"
@@ -247,6 +248,7 @@ for option in ${CONFIG_ARRAY[@]}; do
     if ! grep -q ${option} mailcow.conf; then
       echo "Adding new option \"${option}\" to mailcow.conf"
       echo '# MAILDIR_SUB defines a path in a users virtual home to keep the maildir in. Leave empty for updated setups.' >> mailcow.conf
+      echo "#MAILDIR_SUB=Maildir" >> mailcow.conf
       echo "MAILDIR_SUB=" >> mailcow.conf
   fi
   elif ! grep -q ${option} mailcow.conf; then