diff --git a/machines/akhaten/nsd.nix b/machines/akhaten/nsd.nix
index d4497ba..aa27284 100644
--- a/machines/akhaten/nsd.nix
+++ b/machines/akhaten/nsd.nix
@@ -57,4 +57,5 @@ in
   };
 
   networking.firewall.allowedUDPPorts = [ 53 ];
+  networking.firewall.allowedTCPPorts = [ 53 ];
 }