diff --git a/pkgs/development/python-modules/etuples/default.nix b/pkgs/development/python-modules/etuples/default.nix
index 31a3c9198c7..d2785519bf8 100644
--- a/pkgs/development/python-modules/etuples/default.nix
+++ b/pkgs/development/python-modules/etuples/default.nix
@@ -3,6 +3,7 @@
 , fetchFromGitHub
 , cons
 , multipledispatch
+, py
 , pytestCheckHook
 , pytest-html
 }:
@@ -24,6 +25,7 @@ buildPythonPackage rec {
   ];
 
   checkInputs = [
+    py
     pytestCheckHook
     pytest-html
   ];