diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
index c03bda351a..7dffd5c7e0 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -248,6 +248,9 @@ Trunk (Unreleased)
     HDFS-4106. BPServiceActor#lastHeartbeat, lastBlockReport and
     lastDeletedReport should be volatile. (Jing Zhao via suresh)
 
+    HDFS-4165. Faulty sanity check in FsDirectory.unprotectedSetQuota.
+    (Binglin Chang via suresh)
+
   BREAKDOWN OF HDFS-3077 SUBTASKS
 
     HDFS-3077. Quorum-based protocol for reading and writing edit logs.
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java
index 66103bcf32..ecd4286fa4 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java
@@ -1849,9 +1849,9 @@ INodeDirectory unprotectedSetQuota(String src, long nsQuota, long dsQuota)
     assert hasWriteLock();
     // sanity check
     if ((nsQuota < 0 && nsQuota != HdfsConstants.QUOTA_DONT_SET && 
-         nsQuota < HdfsConstants.QUOTA_RESET) || 
+         nsQuota != HdfsConstants.QUOTA_RESET) || 
         (dsQuota < 0 && dsQuota != HdfsConstants.QUOTA_DONT_SET && 
-          dsQuota < HdfsConstants.QUOTA_RESET)) {
+          dsQuota != HdfsConstants.QUOTA_RESET)) {
       throw new IllegalArgumentException("Illegal value for nsQuota or " +
                                          "dsQuota : " + nsQuota + " and " +
                                          dsQuota);