diff --git a/pkgs/development/python-modules/pysigma/default.nix b/pkgs/development/python-modules/pysigma/default.nix
index d91976067725..b429bb1877a0 100644
--- a/pkgs/development/python-modules/pysigma/default.nix
+++ b/pkgs/development/python-modules/pysigma/default.nix
@@ -34,6 +34,9 @@ buildPythonPackage rec {
 
   build-system = [
     poetry-core
+  ];
+
+  nativeBuildInputs = [
     pythonRelaxDepsHook
   ];