diff --git a/CHANGELOG.md b/CHANGELOG.md
index f78cd7453..bec98e1eb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 0.12.24+4
+
+* Drain browser process `stdout` and `stdin`. This resolves test flakiness, especially in Travis
+  with the `Precise` image.
+
 ## 0.12.24+3
 
 * Extend `deserializeTimeout`.
diff --git a/lib/src/runner/browser/browser.dart b/lib/src/runner/browser/browser.dart
index be07d8a10..79583b6b2 100644
--- a/lib/src/runner/browser/browser.dart
+++ b/lib/src/runner/browser/browser.dart
@@ -51,6 +51,12 @@ abstract class Browser {
   Future get onExit => _onExitCompleter.future;
   final _onExitCompleter = new Completer();
 
+  Future _drainAndIgnore(Stream s) async {
+    try {
+      await s.drain();
+    } on StateError catch (_) {}
+  }
+
   /// Creates a new browser.
   ///
   /// This is intended to be called by subclasses. They pass in [startBrowser],
@@ -65,6 +71,10 @@ abstract class Browser {
       var process = await startBrowser();
       _processCompleter.complete(process);
 
+      // If we don't drain the stdout and stderr the process can hang.
+      await Future.wait(
+          [_drainAndIgnore(process.stdout), _drainAndIgnore(process.stderr)]);
+
       var exitCode = await process.exitCode;
 
       // This hack dodges an otherwise intractable race condition. When the user
diff --git a/pubspec.yaml b/pubspec.yaml
index 8fb69bb5e..ee3b3d85a 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: test
-version: 0.12.24+3
+version: 0.12.24+4
 author: Dart Team <misc@dartlang.org>
 description: A library for writing dart unit tests.
 homepage: https://github.com/dart-lang/test