diff --git a/pkgs/development/python-modules/cupy/default.nix b/pkgs/development/python-modules/cupy/default.nix
index 0eb635c06a15..3af28161ba4e 100644
--- a/pkgs/development/python-modules/cupy/default.nix
+++ b/pkgs/development/python-modules/cupy/default.nix
@@ -49,13 +49,11 @@ let
       outpaths ++ lib.concatMap (outpath: lib.map (output: outpath.${output}) outpath.outputs) outpaths;
   };
 in
-buildPythonPackage rec {
+buildPythonPackage.override { stdenv = cudaPackages.backendStdenv; } rec {
   pname = "cupy";
   version = "13.6.0";
   pyproject = true;
 
-  stdenv = cudaPackages.backendStdenv;
-
   src = fetchFromGitHub {
     owner = "cupy";
     repo = "cupy";