diff --git a/machines/moritz-desktop/configuration.nix b/machines/moritz-desktop/configuration.nix
index fbf0d0c..0ff6902 100644
--- a/machines/moritz-desktop/configuration.nix
+++ b/machines/moritz-desktop/configuration.nix
@@ -53,6 +53,8 @@
     stable.calibre # NOTE: breaks often in unstable
   ];
 
+  networking.firewall.allowedTCPPorts = [9090];
+
   home-manager.users.moritz.services.kanshi.settings = [
     {
       profile.name = "default";