diff --git a/pkgs/development/python-modules/graphql-core/default.nix b/pkgs/development/python-modules/graphql-core/default.nix
index 22372843bdb0..e4a2d5e937cb 100644
--- a/pkgs/development/python-modules/graphql-core/default.nix
+++ b/pkgs/development/python-modules/graphql-core/default.nix
@@ -1,6 +1,7 @@
 { lib
 , buildPythonPackage
 , fetchFromGitHub
+, py
 , pytest-benchmark
 , pytest-asyncio
 , pytestCheckHook
@@ -22,6 +23,7 @@ buildPythonPackage rec {
   };
 
   checkInputs = [
+    py
     pytest-asyncio
     pytest-benchmark
     pytestCheckHook