diff --git a/hadoop-yarn-project/CHANGES.txt b/hadoop-yarn-project/CHANGES.txt
index 35f344b328a..90d3858551d 100644
--- a/hadoop-yarn-project/CHANGES.txt
+++ b/hadoop-yarn-project/CHANGES.txt
@@ -57,6 +57,9 @@ Release 2.7.0 - UNRELEASED
     YARN-2713. "RM Home" link in NM should point to one of the RMs in an 
     HA setup. (kasha)
 
+    YARN-2603. ApplicationConstants missing HADOOP_MAPRED_HOME (Ray Chiang via
+    aw)
+
 Release 2.6.0 - 2014-11-15
 
   INCOMPATIBLE CHANGES
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/ApplicationConstants.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/ApplicationConstants.java
index d42cd67d85b..93438b4786c 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/ApplicationConstants.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/ApplicationConstants.java
@@ -180,6 +180,11 @@ public enum Environment {
      */
     HADOOP_HDFS_HOME("HADOOP_HDFS_HOME"),
     
+    /**
+     * $HADOOP_MAPRED_HOME
+     */
+    HADOOP_MAPRED_HOME("HADOOP_MAPRED_HOME"),
+    
     /**
      * $MALLOC_ARENA_MAX
      */