diff --git a/src/main.rs b/src/main.rs
index 9881f40..5fc6d36 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -12,7 +12,7 @@ struct Worker {
 }
 
 impl Worker {
-    fn new(id: usize, receiver: mpsc::Receiver<Job>) -> Worker {
+    fn new(id: usize, receiver: Arc<Mutex<mpsc::Receiver<Job>>>) -> Worker {
         let thread = thread::spawn(|| {
             receiver;
         });