--- old/src/hotspot/share/opto/classes.cpp	2020-08-13 11:59:10.511641001 +0300
+++ new/src/hotspot/share/opto/classes.cpp	2020-08-13 11:59:10.399643193 +0300
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2020, 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
@@ -45,6 +45,7 @@
 #include "opto/node.hpp"
 #include "opto/opaquenode.hpp"
 #include "opto/rootnode.hpp"
+#include "opto/signum.hpp"
 #include "opto/subnode.hpp"
 #include "opto/subtypenode.hpp"
 #include "opto/vectornode.hpp"