diff --git a/ext/ffi/callback.rs b/ext/ffi/callback.rs
index d1abd0c704..2d2cf491be 100644
--- a/ext/ffi/callback.rs
+++ b/ext/ffi/callback.rs
@@ -96,7 +96,7 @@ struct CallbackInfo {
   pub async_work_sender: mpsc::UnboundedSender<PendingFfiAsyncWork>,
   pub callback: NonNull<v8::Function>,
   pub context: NonNull<v8::Context>,
-  pub parameters: Vec<NativeType>,
+  pub parameters: Box<[NativeType]>,
   pub result: NativeType,
   pub thread_id: u32,
   pub waker: Option<Waker>,
@@ -578,7 +578,7 @@ where
     async_work_sender,
     callback,
     context,
-    parameters: args.parameters.clone(),
+    parameters: args.parameters.clone().into(),
     result: args.result.clone(),
     thread_id,
     waker: None,