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diff --git a/srcjar/org/apache/log4j/helpers/ThreadLocalMap.java b/srcjar/org/apache/log4j/helpers/ThreadLocalMap.java
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+++ b/srcjar/org/apache/log4j/helpers/ThreadLocalMap.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.log4j.helpers;
+
+import java.util.Hashtable;
+
+/**
+   <code>ThreadLocalMap</code> extends {@link InheritableThreadLocal}
+   to bequeath a copy of the hashtable of the MDC of the parent
+   thread.
+
+   @author Ceki G&uuml;lc&uuml;
+   @since 1.2
+*/
+final public class ThreadLocalMap extends InheritableThreadLocal {
+
+  public
+  final
+  Object childValue(Object parentValue) {
+    Hashtable ht = (Hashtable) parentValue;
+    if(ht != null) {
+      return ht.clone();
+    } else {
+      return null;
+    }
+  }
+}