diff --git a/adho-configuration.nix b/adho-configuration.nix
index 7b74d2241..53a410c29 100644
--- a/adho-configuration.nix
+++ b/adho-configuration.nix
@@ -92,6 +92,9 @@
       "Lorry Gjest" = {};
       "Amundsengjest" = {};
     };
+
+    # Open Chromecast-related ports
+    firewall.allowedTCPPorts = [ 5556 5558 ];
   };
 
   hardware.bluetooth.enable = true;