diff --git a/hosts/monolith/configuration.nix b/hosts/monolith/configuration.nix
index 340220f..f2902e5 100644
--- a/hosts/monolith/configuration.nix
+++ b/hosts/monolith/configuration.nix
@@ -223,6 +223,7 @@
     LC_TIME = "de_DE.UTF-8";
   };
 
+  networking.firewall.enable = true;
   networking.hostName = "monolith"; # Define your hostname.
   networking.extraHosts = ''
     127.0.0.1 monolith