diff --git a/lib/rules/subsystem.js b/lib/rules/subsystem.js
index 9c82c26..e90ffb3 100644
--- a/lib/rules/subsystem.js
+++ b/lib/rules/subsystem.js
@@ -63,6 +63,7 @@ const validSubsystems = [
   'stream',
   'string_decoder',
   'sys',
+  'test_runner',
   'timers',
   'tls',
   'trace_events',