diff --git a/pkgs/development/python-modules/numericalunits/default.nix b/pkgs/development/python-modules/numericalunits/default.nix
index b4b463ddc5d8..b58fcf9cba67 100644
--- a/pkgs/development/python-modules/numericalunits/default.nix
+++ b/pkgs/development/python-modules/numericalunits/default.nix
@@ -1,20 +1,24 @@
 {
   lib,
   buildPythonPackage,
+  pythonAtLeast,
   fetchFromGitHub,
   setuptools,
   pytestCheckHook,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "numericalunits";
   version = "1.26";
   pyproject = true;
 
+  # AttributeError: module 'ast' has no attribute 'Num'
+  disabled = pythonAtLeast "3.14";
+
   src = fetchFromGitHub {
     owner = "sbyrnes321";
     repo = "numericalunits";
-    tag = "numericalunits-${version}";
+    tag = "numericalunits-${finalAttrs.version}";
     hash = "sha256-vPB1r+j+p9n+YLnBjHuk2t+QSr+adEOjyC45QSbeb4M=";
   };
 
@@ -26,6 +30,8 @@ buildPythonPackage rec {
     pytestCheckHook
   ];
 
+  pythonImportsCheck = [ "numericalunits" ];
+
   enabledTestPaths = [
     "tests/tests.py"
   ];
@@ -36,4 +42,4 @@ buildPythonPackage rec {
     license = lib.licenses.mit;
     maintainers = with lib.maintainers; [ nickcao ];
   };
-}
+})