diff --git a/hadoop-mapreduce-project/CHANGES.txt b/hadoop-mapreduce-project/CHANGES.txt
index 29c08a4aa11..c3ac3f10b35 100644
--- a/hadoop-mapreduce-project/CHANGES.txt
+++ b/hadoop-mapreduce-project/CHANGES.txt
@@ -249,6 +249,10 @@ Release 2.1.2 - UNRELEASED
     the job is really done - a bug caused by MAPREDUCE-5505. (Zhijie Shen via
     vinodkv)
 
+    MAPREDUCE-5551. Fix compat with hadoop-1 in
+    SequenceFileAsBinaryOutputFormat.WritableValueBytes by re-introducing
+    missing constructors. (Zhijie Shen via acmurthy)
+
 Release 2.1.1-beta - 2013-09-23
 
   INCOMPATIBLE CHANGES
diff --git a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/SequenceFileAsBinaryOutputFormat.java b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/SequenceFileAsBinaryOutputFormat.java
index 60bb16ccb03..6b3a671c6d4 100644
--- a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/SequenceFileAsBinaryOutputFormat.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/SequenceFileAsBinaryOutputFormat.java
@@ -47,6 +47,13 @@ public class SequenceFileAsBinaryOutputFormat
    */
   static protected class WritableValueBytes extends org.apache.hadoop.mapreduce
       .lib.output.SequenceFileAsBinaryOutputFormat.WritableValueBytes {
+    public WritableValueBytes() {
+      super();
+    }
+
+    public WritableValueBytes(BytesWritable value) {
+      super(value);
+    }
   }
 
   /**