diff --git a/build_runner/lib/src/daemon/daemon_builder.dart b/build_runner/lib/src/daemon/daemon_builder.dart
index 767f6d9af..b22f99f4d 100644
--- a/build_runner/lib/src/daemon/daemon_builder.dart
+++ b/build_runner/lib/src/daemon/daemon_builder.dart
@@ -231,7 +231,7 @@ class BuildRunnerDaemonBuilder implements DaemonBuilder {
     DaemonOptions daemonOptions,
   ) async {
     var expectedDeletes = <AssetId>{};
-    var outputStreamController = StreamController<ServerLog>();
+    var outputStreamController = StreamController<ServerLog>(sync: true);
 
     var environment = BuildEnvironment(
       packageGraph,