diff --git a/vala/threads/async_ex.vala b/vala/threads/async_ex.vala
index 669b55a..46a48ae 100644
--- a/vala/threads/async_ex.vala
+++ b/vala/threads/async_ex.vala
@@ -1,8 +1,10 @@
-async void do_smth () {}
 async void async_method(int idx, int max, int step, MainLoopKeeper mlk) {
 	for(var i = 0; i < max; ++i) {
 		stdout.puts(@"Async$idx:$i\n");
-		for(var j = 0; j < step; ++j) yield do_smth();
+		for(var j = 0; j < step; ++j) {
+			Idle.add(async_method.callback);
+			yield;
+		}
 	}
 }