diff --git a/examples/async/simple.ept b/examples/async/simple.ept
index 675724f..85e5d2a 100644
--- a/examples/async/simple.ept
+++ b/examples/async/simple.ept
@@ -1,7 +1,7 @@
 
 node f(x : int) returns (y : int)
 let
-  y = x;
+  y = 0 fby x;
 tel
 
 node main() returns (y : int)