diff --git a/docs/docs/02-concepts/00-cloud-oriented-programming.md b/docs/docs/02-concepts/00-cloud-oriented-programming.md
index f9c90bc6298..1a6949d8402 100644
--- a/docs/docs/02-concepts/00-cloud-oriented-programming.md
+++ b/docs/docs/02-concepts/00-cloud-oriented-programming.md
@@ -22,7 +22,7 @@ let queue = new cloud.Queue(timeout: 2m);
 let bucket = new cloud.Bucket();
 let counter = new cloud.Counter(initial: 100);
 
-queue.setConsumer(inflight (body: str): str => {
+queue.setConsumer(inflight (body: str) => {
   let next = counter.inc();
   let key = "myfile-{next}.txt";
   bucket.put(key, body);