diff --git a/hadoop-tools/hadoop-archives/src/main/java/org/apache/hadoop/tools/HadoopArchives.java b/hadoop-tools/hadoop-archives/src/main/java/org/apache/hadoop/tools/HadoopArchives.java
index 0773c79bdf992..fb400c8385fca 100644
--- a/hadoop-tools/hadoop-archives/src/main/java/org/apache/hadoop/tools/HadoopArchives.java
+++ b/hadoop-tools/hadoop-archives/src/main/java/org/apache/hadoop/tools/HadoopArchives.java
@@ -469,8 +469,8 @@ void archive(Path parentPath, List<Path> srcPaths,
     int numFiles = 0;
     long totalSize = 0;
     FileSystem fs = parentPath.getFileSystem(conf);
-    this.blockSize = conf.getLong(HAR_BLOCKSIZE_LABEL, blockSize);
-    this.partSize = conf.getLong(HAR_PARTSIZE_LABEL, partSize);
+    this.blockSize = conf.getLongBytes(HAR_BLOCKSIZE_LABEL, blockSize);
+    this.partSize = conf.getLongBytes(HAR_PARTSIZE_LABEL, partSize);
     conf.setLong(HAR_BLOCKSIZE_LABEL, blockSize);
     conf.setLong(HAR_PARTSIZE_LABEL, partSize);
     conf.set(DST_HAR_LABEL, archiveName);
diff --git a/hadoop-tools/hadoop-archives/src/test/java/org/apache/hadoop/tools/TestHadoopArchives.java b/hadoop-tools/hadoop-archives/src/test/java/org/apache/hadoop/tools/TestHadoopArchives.java
index 3267a683c275c..a4ddf35679733 100644
--- a/hadoop-tools/hadoop-archives/src/test/java/org/apache/hadoop/tools/TestHadoopArchives.java
+++ b/hadoop-tools/hadoop-archives/src/test/java/org/apache/hadoop/tools/TestHadoopArchives.java
@@ -804,5 +804,29 @@ public void testCopyToLocal() throws Exception {
       localFs.delete(tmpPath, true);      
     }
   }
-  
+
+  @Test
+  public void testBlockSize() throws Exception {
+    conf.set(HadoopArchives.HAR_BLOCKSIZE_LABEL, "1m");
+
+    final String inputPathStr = inputPath.toUri().getPath();
+    final String harName = "foo.har";
+    final String[] args =
+        { "-archiveName", harName, "-p", inputPathStr, "*",
+            archivePath.toString() };
+    System.setProperty(HadoopArchives.TEST_HADOOP_ARCHIVES_JAR_PATH,
+        HADOOP_ARCHIVES_JAR);
+    final HadoopArchives har = new HadoopArchives(conf);
+    assertEquals(0, ToolRunner.run(har, args));
+
+    RemoteIterator<LocatedFileStatus> listFiles =
+        fs.listFiles(new Path(archivePath.toString() + "/" + harName), false);
+    while (listFiles.hasNext()) {
+      LocatedFileStatus next = listFiles.next();
+      if (next.getPath().toString().matches(".*/part-\\d+$")) {
+        // compare blockSize
+        assertEquals(1 * 1024 * 1024, next.getBlockSize());
+      }
+    }
+  }
 }