diff --git a/test/fixedbugs/issue49665.go b/test/fixedbugs/issue49665.go
index c6c22a1b4e..4a6593c454 100644
--- a/test/fixedbugs/issue49665.go
+++ b/test/fixedbugs/issue49665.go
@@ -1,4 +1,4 @@
-// run
+// run -gcflags=-G=3
 
 // Copyright 2021 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style