diff --git a/pkgs/development/python-modules/cypari2/default.nix b/pkgs/development/python-modules/cypari2/default.nix
index bf46bf9a182..1e1248591f0 100644
--- a/pkgs/development/python-modules/cypari2/default.nix
+++ b/pkgs/development/python-modules/cypari2/default.nix
@@ -29,8 +29,11 @@ buildPythonPackage rec {
     ${python.pythonForBuild.pkgs.bootstrapped-pip}/bin/pip install --no-index --prefix=$out --no-cache --build=tmpdir .
   '';
 
-  buildInputs = [
+  nativeBuildInputs = [
     pari
+  ];
+
+  buildInputs = [
     gmp
   ];