1 files changed, 2 insertions, 4 deletions
diff --git a/pkgs/development/interpreters/python/mk-python-derivation.nix b/pkgs/development/interpreters/python/mk-python-derivation.nix
index 72a2805a300..b9a6835908f 100644
--- a/pkgs/development/interpreters/python/mk-python-derivation.nix
+++ b/pkgs/development/interpreters/python/mk-python-derivation.nix
@@ -110,9 +110,7 @@ let self = toPythonModule (python.stdenv.mkDerivation (builtins.removeAttrs attr
   } // meta;
 }));
 
-passthru = {
-  updateScript = let
+passthru.updateScript = let
     filename = builtins.head (lib.splitString ":" self.meta.position);
-  in [ update-python-libraries filename ];
-};
+  in attrs.passthru.updateScript or [ update-python-libraries filename ];
 in lib.extendDerivation true passthru self