diff --git a/modules/nixos/mcpo/default.nix b/modules/nixos/mcpo/default.nix
index 89e0e29..86e943f 100644
--- a/modules/nixos/mcpo/default.nix
+++ b/modules/nixos/mcpo/default.nix
@@ -28,6 +28,12 @@ in
       default = null;
     };
 
+    port = mkOption {
+      type = types.port;
+      default = 8000;
+      description = "Port on which the mcpo service should listen.";
+    };
+
     user = mkOption {
       type = types.str;
       description = "The user the mcpo service will run as.";
@@ -100,7 +106,7 @@ in
       after = [ "network.target" ];
       wantedBy = [ "multi-user.target" ];
       serviceConfig = {
-        ExecStart = "${getExe cfg.package} --config ${configFile}";
+        ExecStart = "${getExe cfg.package} --port ${cfg.port} --config ${configFile}";
         Restart = "on-failure";
         User = cfg.user;
         Group = cfg.group;