diff --git a/hadoop-mapreduce-project/CHANGES.txt b/hadoop-mapreduce-project/CHANGES.txt
index 398a1d2dc6e..f995dad6088 100644
--- a/hadoop-mapreduce-project/CHANGES.txt
+++ b/hadoop-mapreduce-project/CHANGES.txt
@@ -472,6 +472,9 @@ Release 2.1.0-beta - 2013-07-02
     MAPREDUCE-5355. MiniMRYarnCluster with localFs does not work on Windows.
     (Chuan Liu via cnauroth)
 
+    MAPREDUCE-5359. JobHistory should not use File.separator to match timestamp
+    in path. (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-common/src/main/java/org/apache/hadoop/mapreduce/v2/jobhistory/JobHistoryUtils.java b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-common/src/main/java/org/apache/hadoop/mapreduce/v2/jobhistory/JobHistoryUtils.java
index 66471d367cb..6eaddb87c9f 100644
--- a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-common/src/main/java/org/apache/hadoop/mapreduce/v2/jobhistory/JobHistoryUtils.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-common/src/main/java/org/apache/hadoop/mapreduce/v2/jobhistory/JobHistoryUtils.java
@@ -122,7 +122,7 @@ public class JobHistoryUtils {
 
   public static final int SERIAL_NUMBER_DIRECTORY_DIGITS = 6;
   
-  public static final String TIMESTAMP_DIR_REGEX = "\\d{4}" + "\\" + File.separator +  "\\d{2}" + "\\" + File.separator + "\\d{2}";
+  public static final String TIMESTAMP_DIR_REGEX = "\\d{4}" + "\\" + Path.SEPARATOR +  "\\d{2}" + "\\" + Path.SEPARATOR + "\\d{2}";
   public static final Pattern TIMESTAMP_DIR_PATTERN = Pattern.compile(TIMESTAMP_DIR_REGEX);
   private static final String TIMESTAMP_DIR_FORMAT = "%04d" + File.separator + "%02d" + File.separator + "%02d";