--- a/src/hotspot/share/memory/allocation.hpp	Fri Jan 04 20:58:35 2019 +0100
+++ b/src/hotspot/share/memory/allocation.hpp	Fri Jan 04 15:06:01 2019 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -31,6 +31,8 @@
 
 #include <new>
 
+class Thread;
+
 class AllocFailStrategy {
 public:
   enum AllocFailEnum { EXIT_OOM, RETURN_NULL };