diff --git a/systems/x86_64-linux/marvin/services/planka.nix b/systems/x86_64-linux/marvin/services/planka.nix
index 1bd98a0b..1ab09250 100644
--- a/systems/x86_64-linux/marvin/services/planka.nix
+++ b/systems/x86_64-linux/marvin/services/planka.nix
@@ -46,6 +46,7 @@ in
   };
   services.anubis.instances.planka = {
     settings = {
+      COOKIE_DOMAIN = ".cs2a.club";
       BIND = ":${toString d.anubis}";
       POLICY_FNAME = "${pkgs.py.anubis-files}/policies/planka.yaml";
       TARGET = "http://localhost:${toString d.port}";