diff --git a/pkgs/development/tools/castxml/default.nix b/pkgs/development/tools/castxml/default.nix
index d26ef76bb8c..69e48a28a2e 100644
--- a/pkgs/development/tools/castxml/default.nix
+++ b/pkgs/development/tools/castxml/default.nix
@@ -1,17 +1,20 @@
-{ lib
-, stdenv
-, fetchFromGitHub
-, cmake
-, libclang
-, libffi
-, libxml2
-, llvm
-, sphinx
-, zlib
-, withManual ? true
-, withHTML ? true
+{ lib,
+  stdenv,
+  fetchFromGitHub,
+  cmake,
+  libffi,
+  libxml2,
+  zlib,
+  withManual ? true,
+  withHTML ? true,
+  llvmPackages,
+  python3,
 }:
 
+let
+  inherit (llvmPackages) libclang llvm;
+  inherit (python3.pkgs) sphinx;
+in
 stdenv.mkDerivation (finalAttrs: {
   pname = "castxml";
   version = "0.5.1";
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 4ed086889be..fd3c5359671 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -357,10 +357,7 @@ with pkgs;
 
   castget = callPackage ../applications/networking/feedreaders/castget { };
 
-  castxml = callPackage ../development/tools/castxml {
-    inherit (llvmPackages) libclang llvm;
-    inherit (python3.pkgs) sphinx;
-  };
+  castxml = callPackage ../development/tools/castxml { };
 
   catatonit = callPackage ../applications/virtualization/catatonit { };