diff --git a/pkgs/development/python-modules/cssutils/default.nix b/pkgs/development/python-modules/cssutils/default.nix
index a442c2c22e14..7e4447546446 100644
--- a/pkgs/development/python-modules/cssutils/default.nix
+++ b/pkgs/development/python-modules/cssutils/default.nix
@@ -1,10 +1,10 @@
 {
   lib,
   buildPythonPackage,
-  pythonAtLeast,
   pythonOlder,
   fetchFromGitHub,
   setuptools-scm,
+  more-itertools,
   cssselect,
   jaraco-test,
   lxml,
@@ -29,6 +29,8 @@ buildPythonPackage rec {
 
   build-system = [ setuptools-scm ];
 
+  dependencies = [ more-itertools ];
+
   nativeCheckInputs = [
     cssselect
     jaraco-test