diff --git a/nixos/boxes/bolty/virtualisation.nix b/nixos/boxes/bolty/virtualisation.nix
index 6fcdfcbf..29d9f8b2 100644
--- a/nixos/boxes/bolty/virtualisation.nix
+++ b/nixos/boxes/bolty/virtualisation.nix
@@ -20,7 +20,7 @@
     virt-viewer
     lm_sensors
   ];
-  networking.firewall.allowedTCPPorts = [5900];
+  networking.firewall.allowedTCPPorts = [5900 5901];
 
   security.allowUserNamespaces = true;
 }