diff --git a/src/hotspot/share/opto/node.hpp b/src/hotspot/share/opto/node.hpp
index 32f1cc02cadce..0731c324c4991 100644
--- a/src/hotspot/share/opto/node.hpp
+++ b/src/hotspot/share/opto/node.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2021, 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
@@ -1330,6 +1330,9 @@ class DUIterator : public DUIterator_Common {
   DUIterator()
     { /*initialize to garbage*/         debug_only(_vdui = false); }
 
+  DUIterator(const DUIterator& that)
+    { _idx = that._idx;                 debug_only(_vdui = false; reset(that)); }
+
   void operator++(int dummy_to_specify_postfix_op)
     { _idx++;                           VDUI_ONLY(verify_increment()); }
 
@@ -1392,6 +1395,9 @@ class DUIterator_Fast : public DUIterator_Common {
   DUIterator_Fast()
     { /*initialize to garbage*/         debug_only(_vdui = false); }
 
+  DUIterator_Fast(const DUIterator_Fast& that)
+    { _outp = that._outp;               debug_only(_vdui = false; reset(that)); }
+
   void operator++(int dummy_to_specify_postfix_op)
     { _outp++;                          VDUI_ONLY(verify(_node, true)); }
 
@@ -1452,6 +1458,8 @@ class DUIterator_Last : private DUIterator_Fast {
   DUIterator_Last() { }
   // initialize to garbage
 
+  DUIterator_Last(const DUIterator_Last& that) = default;
+
   void operator--()
     { _outp--;              VDUI_ONLY(verify_step(1));  }
 
@@ -1464,8 +1472,7 @@ class DUIterator_Last : private DUIterator_Fast {
     return _outp >= limit._outp;
   }
 
-  void operator=(const DUIterator_Last& that)
-    { DUIterator_Fast::operator=(that); }
+  DUIterator_Last& operator=(const DUIterator_Last& that) = default;
 };
 
 DUIterator_Last Node::last_outs(DUIterator_Last& imin) const {