diff --git a/pkgs/build-support/rust/fetchcrate.nix b/pkgs/build-support/rust/fetchcrate.nix
index 5a896c39c006..423f4d786fde 100644
--- a/pkgs/build-support/rust/fetchcrate.nix
+++ b/pkgs/build-support/rust/fetchcrate.nix
@@ -17,4 +17,4 @@ assert pname == null || pname == crateName;
   url = "${registryDl}/${crateName}/${version}/download";
 } // lib.optionalAttrs unpack {
   extension = "tar.gz";
-} // removeAttrs args [ "crateName" "pname" "version" "unpack" ])
+} // removeAttrs args [ "crateName" "pname" "registryDl" "version" "unpack" ])