diff --git a/hadoop-mapreduce-project/CHANGES.txt b/hadoop-mapreduce-project/CHANGES.txt
index 97a6c6b4ca2..434219c9958 100644
--- a/hadoop-mapreduce-project/CHANGES.txt
+++ b/hadoop-mapreduce-project/CHANGES.txt
@@ -75,6 +75,9 @@ Release 2.6.0 - UNRELEASED
 
     MAPREDUCE-5999. Fix dead link in InputFormat javadoc (Akira AJISAKA via aw)
 
+    MAPREDUCE-5878. some standard JDK APIs are not part of system classes
+    defaults (Sangjin Lee via jlowe)
+
 Release 2.5.0 - UNRELEASED
 
   INCOMPATIBLE CHANGES
diff --git a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml
index 67da7907bfa..bc612d2552f 100644
--- a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml
@@ -1658,9 +1658,9 @@
 
 <property>
    <name>mapreduce.job.classloader.system.classes</name>
-   <value>java.,javax.,org.apache.commons.logging.,org.apache.log4j.,
-          org.apache.hadoop.,core-default.xml,hdfs-default.xml,
-          mapred-default.xml,yarn-default.xml</value>
+   <value>java.,javax.,org.w3c.dom.,org.xml.sax.,org.apache.commons.logging.,
+          org.apache.log4j.,org.apache.hadoop.,core-default.xml,
+          hdfs-default.xml,mapred-default.xml,yarn-default.xml</value>
   <description>A comma-separated list of classes that should be loaded from the
     system classpath, not the user-supplied JARs, when mapreduce.job.classloader
     is enabled. Names ending in '.' (period) are treated as package names,