diff --git a/pkgs/development/python-modules/graphql-subscription-manager/default.nix b/pkgs/development/python-modules/graphql-subscription-manager/default.nix
index bdb34f00353..2ca6a134ee2 100644
--- a/pkgs/development/python-modules/graphql-subscription-manager/default.nix
+++ b/pkgs/development/python-modules/graphql-subscription-manager/default.nix
@@ -9,6 +9,7 @@
 buildPythonPackage rec {
   pname = "graphql-subscription-manager";
   version = "0.5.5";
+  format = "setuptools";
 
   disabled = pythonOlder "3.7";
 
@@ -16,7 +17,7 @@ buildPythonPackage rec {
     owner = "Danielhiversen";
     repo = "PyGraphqlWebsocketManager";
     rev = version;
-    sha256 = "sha256-7MqFsttMNnWmmWKj1zaOORBTDGt6Wm8GU7w56DfPl2c=";
+    hash = "sha256-7MqFsttMNnWmmWKj1zaOORBTDGt6Wm8GU7w56DfPl2c=";
   };
 
   propagatedBuildInputs = [
@@ -27,7 +28,9 @@ buildPythonPackage rec {
   # no tests implemented
   doCheck = false;
 
-  pythonImportsCheck = [ "graphql_subscription_manager" ];
+  pythonImportsCheck = [
+    "graphql_subscription_manager"
+  ];
 
   meta = with lib; {
     description = "Python3 library for graphql subscription manager";