diff --git a/hadoop-mapreduce-project/CHANGES.txt b/hadoop-mapreduce-project/CHANGES.txt
index 74be26b580a..1344da9d1d0 100644
--- a/hadoop-mapreduce-project/CHANGES.txt
+++ b/hadoop-mapreduce-project/CHANGES.txt
@@ -115,6 +115,9 @@ Trunk (unreleased changes)
     MAPREDUCE-1740. NPE in getMatchingLevelForNodes when node locations are 
     variable depth (ahmed via tucu) [IMPORTANT: this is dead code in trunk]
 
+    MAPREDUCE-3990. MRBench allows Long-sized input-lines value
+    but parses CLI argument as an Integer. (harsh)
+
 Release 2.0.1-alpha - UNRELEASED
 
   INCOMPATIBLE CHANGES
diff --git a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/MRBench.java b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/MRBench.java
index bb287cf155a..20d27fbe517 100644
--- a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/MRBench.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/MRBench.java
@@ -230,7 +230,7 @@ public int run(String[] args) throws Exception {
       "[-verbose]";
     
     String jarFile = null;
-    int inputLines = 1; 
+    long inputLines = 1; 
     int numRuns = 1;
     int numMaps = 2; 
     int numReduces = 1;
@@ -248,7 +248,7 @@ public int run(String[] args) throws Exception {
       } else if (args[i].equals("-reduces")) {
         numReduces = Integer.parseInt(args[++i]);
       } else if (args[i].equals("-inputLines")) {
-        inputLines = Integer.parseInt(args[++i]);
+        inputLines = Long.parseLong(args[++i]);
       } else if (args[i].equals("-inputType")) {
         String s = args[++i]; 
         if (s.equalsIgnoreCase("ascending")) {