diff --git a/test/mjsunit/es6/debug-step-into-regexp-subclass.js b/test/mjsunit/es6/debug-step-into-regexp-subclass.js
index 599fe05..5e5eb47 100644
--- a/test/mjsunit/es6/debug-step-into-regexp-subclass.js
+++ b/test/mjsunit/es6/debug-step-into-regexp-subclass.js
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --expose-debug-as debug --harmony-regexp-subclass
+// Flags: --expose-debug-as debug
 
 Debug = debug.Debug