diff --git a/dev_system.nix b/dev_system.nix
index 5b20ab1..512c76c 100644
--- a/dev_system.nix
+++ b/dev_system.nix
@@ -40,6 +40,7 @@ in
 
   networking = {
     firewall = {
+      allowedTCPPorts = [ 3000 ];
       allowedTCPPortRanges = [
         { from = 8000; to = 8020; }
       ];