diff --git a/3-faq-howto/completely.disable.amavisd.clamav.spamassassin.md b/3-faq-howto/completely.disable.amavisd.clamav.spamassassin.md
index d1c5a022..9df8787a 100644
--- a/3-faq-howto/completely.disable.amavisd.clamav.spamassassin.md
+++ b/3-faq-howto/completely.disable.amavisd.clamav.spamassassin.md
@@ -29,10 +29,10 @@ If you want to completely disable spam and virus scanning services, steps:
 
 * Comment out below two lines in Postfix config file `/etc/postfix/main.cf`, then restart Postfix service.
 
-<pre>
+```perl
 content_filter = smtp-amavis:[127.0.0.1]:10024
 receive_override_options = no_address_mappings
-</pre>
+```
 
 * Disable network services: Amavisd, ClamAV.