diff --git a/crates/luaffi/src/lib.rs b/crates/luaffi/src/lib.rs
index 4e920e2..b3c4b6d 100644
--- a/crates/luaffi/src/lib.rs
+++ b/crates/luaffi/src/lib.rs
@@ -3,8 +3,8 @@ use crate::{
     string::{DROP_BUFFER_FN, IS_UTF8_FN, lua_buffer},
 };
 pub use luaffi_impl::*;
+use rustc_hash::FxHashSet;
 use std::{
-    collections::HashSet,
     ffi::{c_double, c_float, c_void},
     fmt::{self, Display, Formatter, Write},
     marker::PhantomData,
@@ -128,8 +128,8 @@ fn cache_local(f: &mut Formatter, list: &[(&str, &str)]) -> fmt::Result {
 
 #[derive(Debug, Clone, Default)]
 pub struct Registry {
-    types: HashSet<String>,
-    decls: HashSet<String>,
+    types: FxHashSet<String>,
+    decls: FxHashSet<String>,
     cdef: String,
     lua: String,
 }