diff --git a/etc/unbound/unbound.conf.d/prefer-ip4.conf b/etc/unbound/unbound.conf.d/prefer-ip4.conf
new file mode 100644
index 00000000..fb5c5dce
--- /dev/null
+++ b/etc/unbound/unbound.conf.d/prefer-ip4.conf
@@ -0,0 +1,9 @@
+server:
+	# Prefer IPv4 transport for sending DNS queries to internet nameservers.
+	#  The only case where I can imagine this being useful is when using
+	#  upstream nameserver with ECS anonymization that has more accurate IPv4
+	#  than IPv6 client-subnet.
+	prefer-ip4: yes
+	prefer-ip6: no
+
+# vim: filetype=unbound.conf
diff --git a/etc/unbound/unbound.conf.d/prefer-ipv6.conf b/etc/unbound/unbound.conf.d/prefer-ip6.conf
similarity index 88%
rename from etc/unbound/unbound.conf.d/prefer-ipv6.conf
rename to etc/unbound/unbound.conf.d/prefer-ip6.conf
index aaadec56..52f5c0db 100644
--- a/etc/unbound/unbound.conf.d/prefer-ipv6.conf
+++ b/etc/unbound/unbound.conf.d/prefer-ip6.conf
@@ -1,5 +1,6 @@
 server:
 	# Prefer IPv6 transport for sending DNS queries to internet nameservers.
+	prefer-ip4: no
 	prefer-ip6: yes
 
 # vim: filetype=unbound.conf