diff --git a/dev/bots/test.dart b/dev/bots/test.dart
index 80617928eb3..a3cf5d1d5fb 100644
--- a/dev/bots/test.dart
+++ b/dev/bots/test.dart
@@ -4,7 +4,6 @@
 
 import 'dart:async';
 import 'dart:io';
-import 'dart:math' as math;
 
 import 'package:path/path.dart' as path;
 
@@ -200,8 +199,6 @@ Future<Null> _pubRunTest(
   bool enableFlutterToolAsserts = false
 }) {
   final List<String> args = <String>['run', 'test', '-rcompact'];
-  final int concurrency = math.max(1, Platform.numberOfProcessors - 1);
-  args.add('-j$concurrency');
   if (!hasColor)
     args.add('--no-color');
   if (testPath != null)