diff --git a/configuration-files/roles/web_server/templates/acme.conf.j2 b/configuration-files/roles/web_server/templates/acme.conf.j2
index 691b9ad..333f64c 100644
--- a/configuration-files/roles/web_server/templates/acme.conf.j2
+++ b/configuration-files/roles/web_server/templates/acme.conf.j2
@@ -28,6 +28,7 @@ server {
 
   location /.well-known/acme-challenge/ {
     proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504 http_403 http_404;
+    proxy_bind            {{ ip6 }};
     proxy_pass            http://acme-backend;
     proxy_read_timeout    5s;
     proxy_connect_timeout 5s;