diff --git a/core/nginx/conf/tls.conf b/core/nginx/conf/tls.conf
index 9100243d..4372c5af 100644
--- a/core/nginx/conf/tls.conf
+++ b/core/nginx/conf/tls.conf
@@ -1,6 +1,6 @@
 ssl_certificate {{ TLS[0] }};
 ssl_certificate_key {{ TLS[1] }};
-{% if TLS_FLAVOR in ['letsencrypt','mail-letsencrypt] %}
+{% if TLS_FLAVOR in ['letsencrypt','mail-letsencrypt'] %}
 ssl_certificate {{ TLS[2] }};
 ssl_certificate_key {{ TLS[3] }};
 {% endif %}