diff --git a/android/jni/com/mapswithme/platform/HttpThread.cpp b/android/jni/com/mapswithme/platform/HttpThread.cpp
index 2aa63b5d0c..f392276111 100644
--- a/android/jni/com/mapswithme/platform/HttpThread.cpp
+++ b/android/jni/com/mapswithme/platform/HttpThread.cpp
@@ -24,20 +24,27 @@ public:
     jclass klass = env->FindClass("com/mapswithme/maps/downloader/DownloadChunkTask");
     ASSERT ( klass, () );
 
-    jmethodID methodId = env->GetMethodID(klass, "<init>", "(JLjava/lang/String;JJJLjava/lang/String;Ljava/lang/String;)V");
+    jmethodID methodId = env->GetMethodID(klass, "<init>", "(JLjava/lang/String;JJJ[BLjava/lang/String;)V");
     ASSERT ( methodId, () );
 
     // User id is always the same, so do not waste time on every chunk call
     static string uniqueUserId = GetPlatform().UniqueClientId();
 
+    jbyteArray postBody = 0;
+    size_t const postBodySize = pb.size();
+    if (postBodySize)
+    {
+      postBody = env->NewByteArray(postBodySize);
+      env->SetByteArrayRegion(postBody, 0, postBodySize, reinterpret_cast<jbyte const *>(pb.c_str()));
+    }
     m_self = env->NewGlobalRef(env->NewObject(klass,
                                               methodId,
                                               reinterpret_cast<jlong>(&cb),
                                               env->NewStringUTF(url.c_str()),
-                                              (jlong)beg,
-                                              (jlong)end,
-                                              (jlong)expectedFileSize,
-                                              env->NewStringUTF(pb.c_str()),
+                                              static_cast<jlong>(beg),
+                                              static_cast<jlong>(end),
+                                              static_cast<jlong>(expectedFileSize),
+                                              postBody,
                                               env->NewStringUTF(uniqueUserId.c_str())));
     ASSERT ( m_self, () );
 
diff --git a/android/src/com/mapswithme/maps/downloader/DownloadChunkTask.java b/android/src/com/mapswithme/maps/downloader/DownloadChunkTask.java
index 0eb523025a..e2ea53c62e 100644
--- a/android/src/com/mapswithme/maps/downloader/DownloadChunkTask.java
+++ b/android/src/com/mapswithme/maps/downloader/DownloadChunkTask.java
@@ -25,7 +25,7 @@ class DownloadChunkTask extends AsyncTask<Void, byte[], Boolean>
   private long m_beg;
   private long m_end;
   private long m_expectedFileSize;
-  private String m_postBody;
+  private byte[] m_postBody;
   private String m_userAgent;
 
   private final int NOT_SET = -1;
@@ -44,7 +44,7 @@ class DownloadChunkTask extends AsyncTask<Void, byte[], Boolean>
   native void onFinish(long httpCallbackID, long httpCode, long beg, long end);
 
   public DownloadChunkTask(long httpCallbackID, String url, long beg, long end,
-                           long expectedFileSize, String postBody, String userAgent)
+                           long expectedFileSize, byte[] postBody, String userAgent)
   {
     m_httpCallbackID = httpCallbackID;
     m_url = url;
@@ -153,15 +153,15 @@ class DownloadChunkTask extends AsyncTask<Void, byte[], Boolean>
           urlConnection.setRequestProperty("Range", String.format("bytes=%d-", m_beg));
       }
 
-      if (m_postBody.length() > 0)
+      if (m_postBody != null)
       {
         urlConnection.setDoOutput(true);
-        byte[] utf8 = m_postBody.getBytes("UTF-8");
-        urlConnection.setFixedLengthStreamingMode(utf8.length);
+        urlConnection.setFixedLengthStreamingMode(m_postBody.length);
 
         final DataOutputStream os = new DataOutputStream(urlConnection.getOutputStream());
-        os.write(utf8);
+        os.write(m_postBody);
         os.flush();
+        m_postBody = null;
         Utils.closeStream(os);
       }