diff --git a/docs/releasenotes.html b/docs/releasenotes.html
index ce3cefa5f..5edc1a675 100644
--- a/docs/releasenotes.html
+++ b/docs/releasenotes.html
@@ -127,6 +127,9 @@
         <li class="body">Fixed inconsistent handling of NLOW (new 
         line on wrap) option by LeftCurly check. (bug 866501)</li> 
 
+        <li class="body">JDK 1.4 classes used by usage checks.
+        (bug 876570)</li>
+
       </ul>
 
       <p class="body">
diff --git a/src/checkstyle/com/puppycrawl/tools/checkstyle/checks/usage/transmogrify/ASTManager.java b/src/checkstyle/com/puppycrawl/tools/checkstyle/checks/usage/transmogrify/ASTManager.java
index 6667de171..29d424277 100644
--- a/src/checkstyle/com/puppycrawl/tools/checkstyle/checks/usage/transmogrify/ASTManager.java
+++ b/src/checkstyle/com/puppycrawl/tools/checkstyle/checks/usage/transmogrify/ASTManager.java
@@ -21,7 +21,6 @@ package com.puppycrawl.tools.checkstyle.checks.usage.transmogrify;
 import java.io.File;
 import java.util.HashMap;
 import java.util.HashSet;
-import java.util.IdentityHashMap;
 import java.util.Iterator;
 import java.util.Map;
 import java.util.Set;
@@ -40,8 +39,13 @@ public final class ASTManager
     /** singleton */
     private static final ASTManager INSTANCE = new ASTManager();
 
-    /** maps DetailASTs to SymTabASTs. */
-    private Map mMap = new IdentityHashMap();
+    /**
+     * Maps DetailASTs to SymTabASTs.
+     * A HashMap is acceptable provided DetailAST method hashCode() returns
+     * distinct integers for distinct objects.
+     * If not, a structure such as IdentityHashMap must be employed.
+     */
+    private Map mMap = new HashMap();
 
     /** root with subtrees for a set of files */
     private SymTabAST mCompleteTree = null;