diff --git a/sites-available/no-default b/sites-available/no-default
index 908b468..436645d 100644
--- a/sites-available/no-default
+++ b/sites-available/no-default
@@ -1,11 +1,11 @@
 # Drop requests for unknown hosts
 #
 # If no default server is defined, nginx will use the first found server.
-# To prevent host header attacks, or other potential problems when an unknown 
-# servername is used in a request, it's recommended to drop the request 
+# To prevent host header attacks, or other potential problems when an unknown
+# servername is used in a request, it's recommended to drop the request
 # returning 444 "no response".
 
 server {
-  listen 80 default_server;
+  listen [::]:80 default_server deferred;
   return 444;
 }
diff --git a/sites-available/ssl.no-default b/sites-available/ssl.no-default
index bb8be6b..e0d60b0 100644
--- a/sites-available/ssl.no-default
+++ b/sites-available/ssl.no-default
@@ -6,6 +6,7 @@
 # returning 444 "no response".
 
 server {
+  listen [::]:443 ssl default_server;
   listen 443 ssl default_server;
   include h5bp/directive-only/ssl.conf;
   return 444;