diff --git a/ops/nixos/marukuru/default.nix b/ops/nixos/marukuru/default.nix
index 1a1ee28402..64e1e27cd2 100644
--- a/ops/nixos/marukuru/default.nix
+++ b/ops/nixos/marukuru/default.nix
@@ -112,6 +112,7 @@ in {
     email = "letsencrypt@lukegb.com";
   };
 
+  virtualisation.docker.extraOptions = "--ipv6 --ip6tables --fixed-cidr-v6 2402:28c0:4:104e:d000::/68";
   virtualisation.oci-containers.containers = {
     heptapod-runner = {
       image = "octobus/heptapod-runner:0.2.0";