diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index 6eaa4083b8..1f8dec3318 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -159,3 +159,11 @@ def CheckChangeOnCommit(input_api, output_api):
   results.extend(input_api.canned_checks.CheckChangeHasTestField(
       input_api, output_api))
   return results
+
+def GetPreferredTrySlaves(project, change):
+  files = change.LocalPaths()
+  if not files:
+    return []
+  # Default trybots to run jobs at (if --bot is not specified).
+  return ['win', 'win_rel', 'mac', 'mac_rel', 'linux', 'linux_rel',
+          'android', 'android_ndk']