diff --git a/hadoop-mapreduce-project/CHANGES.txt b/hadoop-mapreduce-project/CHANGES.txt
index ea8d2a95399..bfd656c3886 100644
--- a/hadoop-mapreduce-project/CHANGES.txt
+++ b/hadoop-mapreduce-project/CHANGES.txt
@@ -484,6 +484,9 @@ Release 2.1.0-beta - 2013-07-02
     MAPREDUCE-5360. TestMRJobClient fails on Windows due to path format.
     (Chuan Liu via cnauroth)
 
+    MAPREDUCE-5366. TestMRAsyncDiskService fails on Windows. (Chuan Liu via
+    cnauroth)
+
     MAPREDUCE-5291. Change MR App to use updated property names in
     container-log4j.properties. (Zhijie Shen via sseth)
 
diff --git a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapreduce/util/TestMRAsyncDiskService.java b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapreduce/util/TestMRAsyncDiskService.java
index 3e05962d865..e1849a3ce9c 100644
--- a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapreduce/util/TestMRAsyncDiskService.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapreduce/util/TestMRAsyncDiskService.java
@@ -59,8 +59,8 @@ public class TestMRAsyncDiskService extends TestCase {
     pathname = (new Path(pathname)).toUri().getPath();
     cwd = (new Path(cwd)).toUri().getPath();
 
-    String [] cwdParts = cwd.split(File.separator);
-    String [] pathParts = pathname.split(File.separator);
+    String [] cwdParts = cwd.split(Path.SEPARATOR);
+    String [] pathParts = pathname.split(Path.SEPARATOR);
 
     // There are three possible cases:
     // 1) pathname and cwd are equal. Return '.'
@@ -94,18 +94,18 @@ public class TestMRAsyncDiskService extends TestCase {
     int parentDirsRequired = cwdParts.length - common;
     for (int i = 0; i < parentDirsRequired; i++) {
       sb.append("..");
-      sb.append(File.separator);
+      sb.append(Path.SEPARATOR);
     }
 
     // Then append all non-common parts of 'pathname' itself.
     for (int i = common; i < pathParts.length; i++) {
       sb.append(pathParts[i]);
-      sb.append(File.separator);
+      sb.append(Path.SEPARATOR);
     }
 
     // Don't end with a '/'.
     String s = sb.toString();
-    if (s.endsWith(File.separator)) {
+    if (s.endsWith(Path.SEPARATOR)) {
       s = s.substring(0, s.length() - 1);
     }