diff --git a/pkgs/development/python-modules/pybind11/default.nix b/pkgs/development/python-modules/pybind11/default.nix
index 4ce742c363ff..4b49b52abe82 100644
--- a/pkgs/development/python-modules/pybind11/default.nix
+++ b/pkgs/development/python-modules/pybind11/default.nix
@@ -2,7 +2,6 @@
   stdenv,
   lib,
   buildPythonPackage,
-  pythonOlder,
   fetchFromGitHub,
   cmake,
   ninja,
@@ -14,7 +13,6 @@
   catch2,
   numpy,
   pytest,
-  libxcrypt,
   makeSetupHook,
 }:
 let
@@ -23,7 +21,7 @@ let
     substitutions = {
       out = placeholder "out";
       pythonInterpreter = python.pythonOnBuildForHost.interpreter;
-      pythonIncludeDir = "${python}/include/python${python.pythonVersion}";
+      pythonIncludeDir = "${python}/include/${python.libPrefix}";
       pythonSitePackages = "${python}/${python.sitePackages}";
     };
   } ./setup-hook.sh;