--- a/src/hotspot/share/interpreter/oopMapCache.hpp	Fri Jan 04 20:58:35 2019 +0100
+++ b/src/hotspot/share/interpreter/oopMapCache.hpp	Fri Jan 04 15:06:01 2019 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, 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
@@ -60,6 +60,7 @@
   virtual void offset_do(int offset) = 0;
 };
 
+class OopMapCacheEntry;
 
 class InterpreterOopMap: ResourceObj {
   friend class OopMapCache;