diff --git a/pillar.example b/pillar.example
index cc42a19..d3070f6 100644
--- a/pillar.example
+++ b/pillar.example
@@ -1,14 +1,14 @@
 postfix:
   smtpd_banner: $myhostname ESMTP $mail_name (Ubuntu)
-  biff: no
+  biff: "'no'"
 
-  append_dot_mydomain: no
+  append_dot_mydomain: "'no'"
 
-  readme_directory: no
+  readme_directory: "'no'"
 
   smtpd_tls_cert_file: /etc/ssl/certs/ssl-cert-snakeoil.pem
   smtpd_tls_key_file: /etc/ssl/private/ssl-cert-snakeoil.key
-  smtpd_use_tls: yes
+  smtpd_use_tls: "'yes'"
   smtpd_tls_session_cache_database: btree:${data_directory}/smtpd_scache
   smtp_tls_session_cache_database: btree:${data_directory}/smtp_scache
 
diff --git a/postfix/config.sls b/postfix/config.sls
index 8e633ca..7b3287a 100644
--- a/postfix/config.sls
+++ b/postfix/config.sls
@@ -22,15 +22,15 @@ include:
     - template: jinja
     - defaults:
         smtpd_banner: {{ salt['pillar.get']('postfix:smtpd_banner', '$myhostname ESMTP $mail_name (Ubuntu)' )}}
-        biff: {{ salt['pillar.get']('postfix:biff', 'no' )}}
+        biff: {{ salt['pillar.get']('postfix:biff', "'no'" )}}
 
-        append_dot_mydomain: {{ salt['pillar.get']('postfix:append_dot_mydomain', 'no' )}}
+        append_dot_mydomain: {{ salt['pillar.get']('postfix:append_dot_mydomain', "'no'" )}}
 
-        readme_directory: {{ salt['pillar.get']('postfix:readme_directory', 'no' )}}
+        readme_directory: {{ salt['pillar.get']('postfix:readme_directory', "'no'" )}}
 
         smtpd_tls_cert_file: {{ salt['pillar.get']('postfix:smtpd_tls_cert_file', '/etc/ssl/certs/ssl-cert-snakeoil.pem' )}}
         smtpd_tls_key_file: {{ salt['pillar.get']('postfix:smtpd_tls_key_file', '/etc/ssl/private/ssl-cert-snakeoil.key' )}}
-        smtpd_use_tls: {{ salt['pillar.get']('postfix:smtpd_use_tls', 'yes' )}}
+        smtpd_use_tls: {{ salt['pillar.get']('postfix:smtpd_use_tls', "'yes'" )}}
         smtpd_tls_session_cache_database: {{ salt['pillar.get']('postfix:smtpd_tls_session_cache_database', 'btree:${data_directory}/smtpd_scache' )}}
         smtp_tls_session_cache_database: {{ salt['pillar.get']('postfix:smtp_tls_session_cache_database', 'btree:${data_directory}/smtp_scache' )}}