diff --git a/pkgs/development/python-modules/recursive-pth-loader/default.nix b/pkgs/development/python-modules/recursive-pth-loader/default.nix
index c49f891ec1de..23e7f0f80b62 100644
--- a/pkgs/development/python-modules/recursive-pth-loader/default.nix
+++ b/pkgs/development/python-modules/recursive-pth-loader/default.nix
@@ -10,7 +10,7 @@ stdenv.mkDerivation {
 
   patchPhase = "cat ${./sitecustomize.py} > sitecustomize.py";
 
-  buildPhase = "${python}/bin/${python.executable} -m compileall .";
+  buildPhase = "${python.pythonForBuild}/bin/${python.pythonForBuild.executable} -m compileall .";
 
   installPhase =
     ''