diff --git a/tvix/default.nix b/tvix/default.nix
index d082e955d..887e9f90f 100644
--- a/tvix/default.nix
+++ b/tvix/default.nix
@@ -4,7 +4,6 @@
 let
   # crate override for crates that need protobuf
   protobufDep = prev: (prev.nativeBuildInputs or [ ]) ++ [ pkgs.buildPackages.protobuf ];
-  iconvDarwinDep = lib.optional pkgs.stdenv.isDarwin pkgs.libiconv;
 
   # On Darwin, some crates producing binaries need to be able to link against security.
   darwinDeps = lib.optionals pkgs.stdenv.isDarwin (with pkgs.buildPackages.darwin.apple_sdk.frameworks; [
@@ -34,11 +33,6 @@ let
   # Load the crate2nix crate tree.
   crates = pkgs.callPackage ./Cargo.nix {
     defaultCrateOverrides = pkgs.defaultCrateOverrides // {
-      zstd-sys = prev: {
-        nativeBuildInputs = prev.nativeBuildInputs or [ ];
-        buildInputs = prev.buildInputs or [ ] ++ iconvDarwinDep;
-      };
-
       opentelemetry-proto = prev: {
         nativeBuildInputs = protobufDep prev;
       };
@@ -246,7 +240,7 @@ in
 
     buildInputs = [
       pkgs.fuse
-    ] ++ iconvDarwinDep;
+    ] ++ lib.optional pkgs.stdenv.isDarwin pkgs.libiconv;
 
     buildPhase = ''
       cargo doc --document-private-items