diff --git a/site.conf b/site.conf
index 8e50ab5..ee31ebb 100644
--- a/site.conf
+++ b/site.conf
@@ -5,7 +5,7 @@
 	release => '0.3.99-exp' . nightly,
 
 	prefix4 => '10.112.0.0/18',
-	prefix6 => 'fd51:2bb2:fd0d::/48',
+	prefix6 => 'fd51:2bb2:fd0d::/64',
 
 	timezone => 'CET-1CEST,M3.5.0,M10.5.0/3', # Europe/Berlin
 	ntp_servers => ['1.ntp.services.ffhl'],