diff --git a/setup/mail-dovecot.sh b/setup/mail-dovecot.sh
index 0cfeafc4..99989d32 100755
--- a/setup/mail-dovecot.sh
+++ b/setup/mail-dovecot.sh
@@ -69,7 +69,7 @@ tools/editconf.py /etc/dovecot/conf.d/10-mail.conf \
 cp conf/dovecot/conf.d/15-mailboxes.conf /etc/dovecot/conf.d/
 sed -i "s/#mail_plugins =\(.*\)/mail_plugins =\1 \$mail_plugins quota/" /etc/dovecot/conf.d/10-mail.conf
 if ! grep -q "mail_plugins.* imap_quota" /etc/dovecot/conf.d/20-imap.conf; then
-    sed -i "s/mail_plugins =\(.*\)/mail_plugins =\1 imap_quota/" /etc/dovecot/conf.d/20-imap.conf
+  sed -i "s/\(mail_plugins =.*\)/\1\n  mail_plugins = \$mail_plugins imap_quota/" /etc/dovecot/conf.d/20-imap.conf
 fi
 
 # configure stuff for quota support