diff --git a/src/ch20-03-graceful-shutdown-and-cleanup.md b/src/ch20-03-graceful-shutdown-and-cleanup.md
index e255e32a81..c24e463340 100644
--- a/src/ch20-03-graceful-shutdown-and-cleanup.md
+++ b/src/ch20-03-graceful-shutdown-and-cleanup.md
@@ -217,7 +217,7 @@ impl Worker {
                     Message::NewJob(job) => {
                         println!("Worker {} got a job; executing.", id);
 
-                        job.call_box();
+                        job();
                     },
                     Message::Terminate => {
                         println!("Worker {} was told to terminate.", id);