diff --git a/src/lune/builtins/fs/mod.rs b/src/lune/builtins/fs/mod.rs
index 8cda26d..7478118 100644
--- a/src/lune/builtins/fs/mod.rs
+++ b/src/lune/builtins/fs/mod.rs
@@ -31,10 +31,10 @@ pub fn create(lua: &Lua) -> LuaResult<LuaTable> {
         .build_readonly()
 }
 
-async fn fs_read_file(lua: &Lua, path: String) -> LuaResult<LuaString> {
+async fn fs_read_file(lua: &Lua, path: String) -> LuaResult<LuaAnyUserData> {
     let bytes = fs::read(&path).await.into_lua_err()?;
 
-    lua.create_string(bytes)
+    lua.create_buffer(bytes)
 }
 
 async fn fs_read_dir(_: &Lua, path: String) -> LuaResult<Vec<String>> {
@@ -66,19 +66,8 @@ async fn fs_read_dir(_: &Lua, path: String) -> LuaResult<Vec<String>> {
     Ok(dir_strings_no_prefix)
 }
 
-async fn fs_write_file(lua: &Lua, (path, contents): (String, LuaValue<'_>)) -> LuaResult<()> {
-    let contents_str = match contents {
-        LuaValue::String(str) => Ok(BString::from(str.to_str()?)),
-        LuaValue::UserData(inner) => lua.unpack::<BString>(LuaValue::UserData(inner)),
-        other => Err(LuaError::runtime(format!(
-            "Expected type string or buffer, got {}",
-            other.type_name()
-        ))),
-    }?;
-
-    fs::write(&path, contents_str.as_bytes())
-        .await
-        .into_lua_err()
+async fn fs_write_file(_: &Lua, (path, contents): (String, BString)) -> LuaResult<()> {
+    fs::write(&path, contents.as_bytes()).await.into_lua_err()
 }
 
 async fn fs_write_dir(_: &Lua, path: String) -> LuaResult<()> {