diff --git a/pkgs/development/python-modules/pyws66i/default.nix b/pkgs/development/python-modules/pyws66i/default.nix
index 47df29289202..aa196c646a69 100644
--- a/pkgs/development/python-modules/pyws66i/default.nix
+++ b/pkgs/development/python-modules/pyws66i/default.nix
@@ -3,7 +3,9 @@
   buildPythonPackage,
   fetchFromGitHub,
   pytestCheckHook,
+  pythonAtLeast,
   pythonOlder,
+  standard-telnetlib,
 }:
 
 buildPythonPackage rec {
@@ -20,6 +22,8 @@ buildPythonPackage rec {
     hash = "sha256-NTL2+xLqSNsz4YdUTwr0nFjhm1NNgB8qDnWSoE2sizY=";
   };
 
+  dependencies = lib.optionals (pythonAtLeast "3.13") [ standard-telnetlib ];
+
   nativeCheckInputs = [ pytestCheckHook ];
 
   pythonImportsCheck = [ "pyws66i" ];