diff --git a/hadoop-mapreduce-project/CHANGES.txt b/hadoop-mapreduce-project/CHANGES.txt
index 38f0de0ba9f..e7e7ef12193 100644
--- a/hadoop-mapreduce-project/CHANGES.txt
+++ b/hadoop-mapreduce-project/CHANGES.txt
@@ -628,6 +628,9 @@ Release 0.23.5 - UNRELEASED
 
     MAPREDUCE-4729. job history UI not showing all job attempts. (Vinod
     Kumar Vavilapalli via jlowe)
+
+    MAPREDUCE-4763 repair test TestUmbilicalProtocolWithJobToken (Ivan A.
+    Veselovsky via bobby)
  
 Release 0.23.4 - UNRELEASED
 
diff --git a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapreduce/security/TestUmbilicalProtocolWithJobToken.java b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapreduce/security/TestUmbilicalProtocolWithJobToken.java
index 4736d1935b2..8b3ba3a3aa6 100644
--- a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapreduce/security/TestUmbilicalProtocolWithJobToken.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapreduce/security/TestUmbilicalProtocolWithJobToken.java
@@ -51,11 +51,14 @@ import org.apache.hadoop.security.SecurityUtil;
 import org.apache.hadoop.security.UserGroupInformation;
 
 import org.apache.log4j.Level;
-import org.junit.Ignore;
 import org.junit.Test;
 
-/** Unit tests for using Job Token over RPC. */
-@Ignore
+/** Unit tests for using Job Token over RPC. 
+ * 
+ * System properties required:
+ * -Djava.security.krb5.conf=.../hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/target/test-classes/krb5.conf 
+ * -Djava.net.preferIPv4Stack=true
+ */
 public class TestUmbilicalProtocolWithJobToken {
   private static final String ADDRESS = "0.0.0.0";