diff --git a/workerpool.go b/workerpool.go
index d640cb1..71d262a 100644
--- a/workerpool.go
+++ b/workerpool.go
@@ -94,9 +94,8 @@ func (wp *WorkerPool) Submit(id string, f func(ctx context.Context) error) error
 		wp.mu.Unlock()
 		return ErrDraining
 	}
-
-	wp.mu.Unlock()
 	wp.wg.Add(1)
+	wp.mu.Unlock()
 	wp.tasks <- &task{
 		id:  id,
 		run: f,