diff --git a/hadoop-mapreduce-project/CHANGES.txt b/hadoop-mapreduce-project/CHANGES.txt
index 0bf5c9bf25..ba1a2d2f97 100644
--- a/hadoop-mapreduce-project/CHANGES.txt
+++ b/hadoop-mapreduce-project/CHANGES.txt
@@ -180,6 +180,9 @@ Release 2.5.0 - UNRELEASED
     MAPREDUCE-4937. MR AM handles an oversized split metainfo file poorly
     (Eric Payne via jlowe)
 
+    MAPREDUCE-5642. TestMiniMRChildTask fails on Windows.
+    (Chuan Liu via cnauroth)
+
 Release 2.4.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES
diff --git a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/TestMiniMRChildTask.java b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/TestMiniMRChildTask.java
index ec447c28a7..17b5fd28f1 100644
--- a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/TestMiniMRChildTask.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/TestMiniMRChildTask.java
@@ -254,6 +254,19 @@ public void configure(JobConf job) {
       checkEnv("NEW_PATH", File.pathSeparator + "/tmp", "noappend");
       // check if X=$(tt's X var):/tmp for an old env variable inherited from 
       // the tt
+      if (Shell.WINDOWS) {
+        // On Windows, PATH is replaced one more time as part of default config
+        // of "mapreduce.admin.user.env", i.e. on Windows,
+        // "mapreduce.admin.user.env" is set to
+        // "PATH=%PATH%;%HADOOP_COMMON_HOME%\\bin"
+        String hadoopHome = System.getenv("HADOOP_COMMON_HOME");
+        if (hadoopHome == null) {
+          hadoopHome = "";
+        }
+        String hadoopLibLocation = hadoopHome + "\\bin";
+        path += File.pathSeparator + hadoopLibLocation;
+        path += File.pathSeparator + path;
+      }
       checkEnv("PATH",  path + File.pathSeparator + "/tmp", "noappend");
 
       String jobLocalDir = job.get(MRJobConfig.JOB_LOCAL_DIR);
@@ -308,6 +321,19 @@ public void configure(JobConf job) {
       checkEnv("NEW_PATH", File.pathSeparator + "/tmp", "noappend");
       // check if X=$(tt's X var):/tmp for an old env variable inherited from 
       // the tt
+      if (Shell.WINDOWS) {
+        // On Windows, PATH is replaced one more time as part of default config
+        // of "mapreduce.admin.user.env", i.e. on Windows,
+        // "mapreduce.admin.user.env"
+        // is set to "PATH=%PATH%;%HADOOP_COMMON_HOME%\\bin"
+        String hadoopHome = System.getenv("HADOOP_COMMON_HOME");
+        if (hadoopHome == null) {
+          hadoopHome = "";
+        }
+        String hadoopLibLocation = hadoopHome + "\\bin";
+        path += File.pathSeparator + hadoopLibLocation;
+        path += File.pathSeparator + path;
+      }
       checkEnv("PATH",  path + File.pathSeparator + "/tmp", "noappend");
 
     }