diff --git a/pkgs/development/python-modules/natsort/default.nix b/pkgs/development/python-modules/natsort/default.nix
index a5940ed6c9f..3e4b0d1368b 100644
--- a/pkgs/development/python-modules/natsort/default.nix
+++ b/pkgs/development/python-modules/natsort/default.nix
@@ -1,12 +1,9 @@
 { lib
 , buildPythonPackage
 , pythonOlder
-, isPy35
-, isPy36
 , fetchPypi
 , hypothesis
 , pytestcache
-, pytestcov
 , pytestflakes
 , pytestpep8
 , pytest
@@ -19,10 +16,9 @@ buildPythonPackage rec {
   pname = "natsort";
   version = "5.2.0";
 
-  buildInputs = [
+  checkInputs = [
     hypothesis
     pytestcache
-    pytestcov
     pytestflakes
     pytestpep8
     pytest
@@ -41,7 +37,7 @@ buildPythonPackage rec {
   # testing based on project's tox.ini
   checkPhase = ''
     pytest --doctest-modules natsort
-    pytest --flakes --pep8 --cov natsort --cov-report term-missing
+    pytest --flakes --pep8
   '';
 
   meta = {