diff --git a/samples/ffi/async/async_test.dart b/samples/ffi/async/async_test.dart
index f43858215aa..3210140aa91 100644
--- a/samples/ffi/async/async_test.dart
+++ b/samples/ffi/async/async_test.dart
@@ -9,7 +9,10 @@
 import 'sample_async_callback.dart' as sample0;
 import 'sample_native_port_call.dart' as sample1;
 
-main() {
-  sample0.main();
-  sample1.main();
+main() async {
+  print('==========');
+  await sample0.main();
+  print('==========');
+  await sample1.main();
+  print('==========');
 }
diff --git a/samples_2/ffi/async/async_test.dart b/samples_2/ffi/async/async_test.dart
index 297a76ea6bc..5470052ac1a 100644
--- a/samples_2/ffi/async/async_test.dart
+++ b/samples_2/ffi/async/async_test.dart
@@ -11,7 +11,10 @@
 import 'sample_async_callback.dart' as sample0;
 import 'sample_native_port_call.dart' as sample1;
 
-main() {
-  sample0.main();
-  sample1.main();
+main() async {
+  print('==========');
+  await sample0.main();
+  print('==========');
+  await sample1.main();
+  print('==========');
 }