diff --git a/pkgs/development/python-modules/idna/2.nix b/pkgs/development/python-modules/idna/2.nix
index 613fde773a7..9a1c1dc271f 100644
--- a/pkgs/development/python-modules/idna/2.nix
+++ b/pkgs/development/python-modules/idna/2.nix
@@ -1,6 +1,7 @@
 { lib
 , buildPythonPackage
 , fetchPypi
+, pytestCheckHook
 }:
 
 buildPythonPackage rec {
@@ -12,6 +13,8 @@ buildPythonPackage rec {
     sha256 = "b307872f855b18632ce0c21c5e45be78c0ea7ae4c15c828c20788b26921eb3f6";
   };
 
+  checkInputs = [ pytestCheckHook ];
+
   meta = {
     homepage = "https://github.com/kjd/idna/";
     description = "Internationalized Domain Names in Applications (IDNA)";