diff --git a/rootfs/etc/confd/templates/dovecot-oauth2.token.conf.ext.tmpl b/rootfs/etc/confd/templates/dovecot-oauth2.token.conf.ext.tmpl
index f4b1442..4ece4cd 100644
--- a/rootfs/etc/confd/templates/dovecot-oauth2.token.conf.ext.tmpl
+++ b/rootfs/etc/confd/templates/dovecot-oauth2.token.conf.ext.tmpl
@@ -8,3 +8,4 @@ tls_ca_cert_file = /etc/ssl/certs/ca-certificates.crt
 use_grant_password = no
 pass_attrs = pass=%{oauth2:access_token}
 debug = yes
+username_format = %n