diff --git a/pkgs/development/python-modules/cookiecutter/default.nix b/pkgs/development/python-modules/cookiecutter/default.nix
index 34c21372aee..873cbe142d9 100644
--- a/pkgs/development/python-modules/cookiecutter/default.nix
+++ b/pkgs/development/python-modules/cookiecutter/default.nix
@@ -1,6 +1,7 @@
 { stdenv, buildPythonPackage, fetchPypi, isPyPy
 , pytest, pytestcov, pytest-mock, freezegun
-, jinja2, future, binaryornot, click, whichcraft, poyo, jinja2_time, requests }:
+, jinja2, future, binaryornot, click, whichcraft, poyo, jinja2_time, requests
+, python-slugify }:
 
 buildPythonPackage rec {
   pname = "cookiecutter";
@@ -16,7 +17,7 @@ buildPythonPackage rec {
 
   checkInputs = [ pytest pytestcov pytest-mock freezegun ];
   propagatedBuildInputs = [
-    jinja2 future binaryornot click whichcraft poyo jinja2_time requests
+    jinja2 future binaryornot click whichcraft poyo jinja2_time requests python-slugify
   ];
   
   # requires network access for cloning git repos