diff --git a/fileserver/workerpool/workerpool.go b/fileserver/workerpool/workerpool.go
index 9133cb3..40984c9 100644
--- a/fileserver/workerpool/workerpool.go
+++ b/fileserver/workerpool/workerpool.go
@@ -25,6 +25,7 @@ func CreateWorkerPool(jobCB JobCB, n int) *WorkPool {
 	pool := new(WorkPool)
 	pool.jobCB = jobCB
 	pool.jobs = make(chan Job, 100)
+	pool.closer = z.NewCloser(n)
 	for i := 0; i < n; i++ {
 		go pool.run(pool.jobs)
 	}