diff --git a/hosts/docker/configuration.nix b/hosts/docker/configuration.nix
index acdda9b..9040898 100644
--- a/hosts/docker/configuration.nix
+++ b/hosts/docker/configuration.nix
@@ -135,7 +135,7 @@ system.userActivationScripts.createSetupSymlink.text = ''
   services.openssh.settings.PermitRootLogin = "yes";
 
   # Open ports in the firewall.
-  networking.firewall.allowedTCPPorts = [ 80 8080 443 9323 ];
+  networking.firewall.allowedTCPPorts = [ 80 8080 443 9323 2375 ];
   # networking.firewall.allowedUDPPorts = [ ... ];
   # Or disable the firewall altogether.
   # networking.firewall.enable = false;