diff --git a/hadoop-common-project/hadoop-common/CHANGES.txt b/hadoop-common-project/hadoop-common/CHANGES.txt
index 528f5e5a25..3adee445e5 100644
--- a/hadoop-common-project/hadoop-common/CHANGES.txt
+++ b/hadoop-common-project/hadoop-common/CHANGES.txt
@@ -588,6 +588,10 @@ Release 2.5.0 - UNRELEASED
     HADOOP-10689. InputStream is not closed in
     AzureNativeFileSystemStore#retrieve(). (Chen He via cnauroth)
 
+    HADOOP-10690. Lack of synchronization on access to InputStream in
+    NativeAzureFileSystem#NativeAzureFsInputStream#close().
+    (Chen He via cnauroth)
+
   BREAKDOWN OF HADOOP-10514 SUBTASKS AND RELATED JIRAS
 
     HADOOP-10520. Extended attributes definition and FileSystem APIs for
diff --git a/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azure/NativeAzureFileSystem.java b/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azure/NativeAzureFileSystem.java
index 30e6b3091e..87dc9787f0 100644
--- a/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azure/NativeAzureFileSystem.java
+++ b/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azure/NativeAzureFileSystem.java
@@ -193,7 +193,7 @@ public synchronized int read(byte[] b, int off, int len) throws IOException {
     }
 
     @Override
-    public void close() throws IOException {
+    public synchronized void close() throws IOException {
       in.close();
     }