diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index d7dae96a18cb..ebc912ab44ee 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -23207,7 +23207,8 @@ with pkgs;
   in pkgs.buildEnv { # slightly hacky
     name = "libxml2+py-${res.libxml2.version}";
     paths = with libxml2; [ dev bin py ];
-    inherit (libxml2) passthru;
+    # Avoid update.nix conflicts with libxml2.
+    passthru = builtins.removeAttrs libxml2.passthru [ "updateScript" ];
     # the hook to find catalogs is hidden by buildEnv
     postBuild = ''
       mkdir "$out/nix-support"