diff --git a/ops/maint/update_nixpkgs/default.nix b/ops/maint/update_nixpkgs/default.nix
index 8a80357115..dde81f3938 100644
--- a/ops/maint/update_nixpkgs/default.nix
+++ b/ops/maint/update_nixpkgs/default.nix
@@ -2,7 +2,7 @@
 let
   inherit (depot) pkgs;
   mercurial = (pkgs.mercurial.overridePythonAttrs (origAttrs: {
-    propagatedBuildInputs = origAttrs.propagatedBuildInputs ++ [pkgs.python3Packages.hg-evolve];
+    propagatedBuildInputs = [pkgs.python3Packages.hg-evolve];
   }));
   updateNixpkgs = pkgs.runCommandNoCC "update_nixpkgs" {
     buildInputs = with pkgs; [ makeWrapper ];