diff --git a/r9/src/listhead.rs b/r9/src/listhead.rs
index d877a96..9a21544 100644
--- a/r9/src/listhead.rs
+++ b/r9/src/listhead.rs
@@ -13,9 +13,6 @@ pub struct ListHead<T> {
     _self_wp: Weak::<RefCell::<Self>>,
 }
 
-unsafe impl<T> Send for ListHead<T> {}
-unsafe impl<T> Sync for ListHead<T> {}
-
 impl<T> ListHead<T> {
 
     fn new(data: Weak::<RefCell::<T>>) -> Rc::<RefCell::<Self>> {
diff --git a/r9/src/queue.rs b/r9/src/queue.rs
index 268e2e3..0bbde69 100644
--- a/r9/src/queue.rs
+++ b/r9/src/queue.rs
@@ -14,9 +14,6 @@ pub struct Queue<T> {
     pub work_list: Mutex<Rc::<RefCell::<crate::ListHead<T>>>>,
 }
 
-unsafe impl<T> Send for Queue<T> {}
-unsafe impl<T> Sync for Queue<T> {}
-
 impl<T> Queue<T> {
 
     pub fn new() -> Rc::<RefCell::<Self>> {