diff --git a/nixos/modules/services/misc/taskserver/default.nix b/nixos/modules/services/misc/taskserver/default.nix
index c21b4384ba43..8a860ba44142 100644
--- a/nixos/modules/services/misc/taskserver/default.nix
+++ b/nixos/modules/services/misc/taskserver/default.nix
@@ -329,7 +329,7 @@ in
       };
 
       listenPort = lib.mkOption {
-        type = lib.types.int;
+        type = lib.types.port;
         default = 53589;
         description = ''
           Port number of the Taskserver.