diff --git a/pkgs/development/python-modules/clize/default.nix b/pkgs/development/python-modules/clize/default.nix
index ce1ad60a5321..72b6a2fa30ae 100644
--- a/pkgs/development/python-modules/clize/default.nix
+++ b/pkgs/development/python-modules/clize/default.nix
@@ -8,8 +8,9 @@
 , od
 , docutils
 , repeated_test
-, unittest2
 , pygments
+, unittest2
+, pytest
 }:
 
 buildPythonPackage rec {
@@ -21,14 +22,15 @@ buildPythonPackage rec {
     sha256 = "f54dedcf6fea90a3e75c30cb65e0ab1e832760121f393b8d68edd711dbaf7187";
   };
 
-  checkInputs = [ 
+  checkInputs = [
     dateutil
     pygments
     repeated_test
     unittest2
+    pytest
   ];
-  
-  propagatedBuildInputs = [ 
+
+  propagatedBuildInputs = [
     attrs
     docutils
     od
@@ -36,6 +38,10 @@ buildPythonPackage rec {
     six
   ];
 
+  checkPhase = ''
+    pytest
+  '';
+
   meta = with stdenv.lib; {
     description = "Command-line argument parsing for Python";
     homepage = "https://github.com/epsy/clize";