diff --git a/membrane/src/runtime.rs b/membrane/src/runtime.rs
index 2170102..f4bd7d9 100644
--- a/membrane/src/runtime.rs
+++ b/membrane/src/runtime.rs
@@ -31,6 +31,7 @@ pub trait Interface {
 
 pub struct JoinHandle {
   pub abort: Box<dyn Fn()>,
+  pub abort: Box<dyn Fn() + Send + 'static>,
 }
 
 impl JoinHandle {
@@ -39,6 +40,9 @@ impl JoinHandle {
   }
 }
 
+unsafe impl Send for AbortHandle {}
+unsafe impl Sync for AbortHandle {}
+
 pub struct Info<'a> {
   pub name: &'a str,
 }