diff --git a/nixos/machines/k3s/default.nix b/nixos/machines/k3s/default.nix
index cfd2217..e433099 100644
--- a/nixos/machines/k3s/default.nix
+++ b/nixos/machines/k3s/default.nix
@@ -24,6 +24,7 @@
       "--data-dir=/var/lib/k3s" # Set data dir to var lib
       "--cluster-init" # Enable embedded etcd
       "--cluster-cidr=10.69.0.0/16" # the default of 10.42.0.0/16 clashes with my own network
+      "--tls-san asraphiel.dev" # Set the SAN to the hostname
     ];
   };
 }