diff --git a/advanced/01-pihole.conf b/advanced/01-pihole.conf
index cd74e186..8aa35fe1 100644
--- a/advanced/01-pihole.conf
+++ b/advanced/01-pihole.conf
@@ -41,3 +41,8 @@ log-facility=/var/log/pihole.log
 local-ttl=2
 
 log-async
+
+# Signal to Firefox that the local network is unsuitable for DNS-over-HTTPS
+# This follows https://support.mozilla.org/en-US/kb/configuring-networks-disable-dns-over-https
+# (sourced 7th September 2019)
+server=/use-application-dns.net/