diff --git a/test/stream_completer_test.dart b/test/stream_completer_test.dart
index 3db28a9..f58162e 100644
--- a/test/stream_completer_test.dart
+++ b/test/stream_completer_test.dart
@@ -38,7 +38,7 @@ void main() {
     var subscription = controller.stream.listen(events.add);
     var done = subscription.asFuture();
     subscription.pause();
-    var sourceController = StreamController<void>();
+    var sourceController = StreamController<int>();
     sourceController
       ..add(1)
       ..add(2)
diff --git a/test/stream_sink_completer_test.dart b/test/stream_sink_completer_test.dart
index e00ecc8..3a6f25b 100644
--- a/test/stream_sink_completer_test.dart
+++ b/test/stream_sink_completer_test.dart
@@ -46,7 +46,7 @@ void main() {
       var sink = TestSink();
       completer.setDestinationSink(sink);
 
-      var controller = StreamController<void>();
+      var controller = StreamController<int>();
       completer.sink.addStream(controller.stream);
 
       controller.add(1);
@@ -152,7 +152,7 @@ void main() {
     });
 
     test('addStream is forwarded', () async {
-      var controller = StreamController<void>();
+      var controller = StreamController<int>();
       completer.sink.addStream(controller.stream);
 
       controller.add(1);