diff --git a/postfix/files/main.cf b/postfix/files/main.cf
index 3e1136c..9299055 100644
--- a/postfix/files/main.cf
+++ b/postfix/files/main.cf
@@ -43,7 +43,7 @@
 # SASL parameters (http://www.postfix.org/SASL_README.html)
 {%- do relay_restrictions.append('permit_sasl_authenticated') %}
 {%- do recipient_restrictions.append('permit_sasl_authenticated') %}
-{{ set_parameter('smtpd_sasl_auth_enable') }}
+{{ set_parameter('smtpd_sasl_auth_enable', 'yes') }}
 {{ set_parameter('smtpd_sasl_path', 'smtpd') }}
 {{ set_parameter('smtpd_sasl_type', 'cyrus') }}
 {{ set_parameter('smtpd_sasl_security_options', ['noanonymous', 'noplaintext']) }}