diff --git a/src/compat_worker.rs b/src/compat_worker.rs
index d41ea3e3..aec93678 100644
--- a/src/compat_worker.rs
+++ b/src/compat_worker.rs
@@ -3,11 +3,11 @@ pub type INWorker<'a,Task>=CompatNWorker<'a,Task>;
 
 pub struct CompatNWorker<'a,Task>{
 	data:std::marker::PhantomData<Task>,
-	f:Box<dyn FnMut(Task)+'a>,
+	f:Box<dyn FnMut(Task)+Send+'a>,
 }
 
 impl<'a,Task> CompatNWorker<'a,Task>{
-	pub fn new(f:impl FnMut(Task)+'a)->CompatNWorker<'a,Task>{
+	pub fn new(f:impl FnMut(Task)+Send+'a)->CompatNWorker<'a,Task>{
 		Self{
 			data:std::marker::PhantomData,
 			f:Box::new(f),