diff --git a/servo-tidy.toml b/servo-tidy.toml
index 3a703b00e08..708cd17480e 100644
--- a/servo-tidy.toml
+++ b/servo-tidy.toml
@@ -40,7 +40,9 @@ packages = [
   "crossbeam-utils",
   "digest",
   "generic-array",
+  "nix", # https://github.com/servo/servo/issues/23189#issuecomment-487512605
   "rand",
+  "rand_core",
   "unicase",
 ]
 # Files that are ignored for all tidy and lint checks.