diff --git a/msgpack-core/src/main/java/org/msgpack/core/MessageUnpacker.java b/msgpack-core/src/main/java/org/msgpack/core/MessageUnpacker.java
index 7a90b7a9a..a1b28b640 100644
--- a/msgpack-core/src/main/java/org/msgpack/core/MessageUnpacker.java
+++ b/msgpack-core/src/main/java/org/msgpack/core/MessageUnpacker.java
@@ -208,36 +208,44 @@ private MessageBuffer prepareNumberBuffer(int readLength)
             position += readLength;  // here assumes following buffer.getXxx never throws exception
             return buffer; // Return the default buffer
         }
-        else if (remaining == 0) {
-            buffer = getNextBuffer();
-            position = readLength;
-            nextReadPosition = 0;
-            return buffer;
-        }
         else {
-            // When the default buffer doesn't contain the whole length
-
-            // TODO This doesn't work if MessageBuffer is allocated by newDirectBuffer.
-            //      Add copy method to MessageBuffer to solve this issue.
-
-            // Copy the data fragment from the current buffer
-
-            numberBuffer.putBytes(0,
-                                  buffer.array(), buffer.arrayOffset() + position,
-                                  remaining);
-
-            // TODO loop this method until castBuffer is filled
-            MessageBuffer next = getNextBuffer();
+            // When the default buffer doesn't contain the whole length,
+            // fill the temporary buffer from the current data fragment and
+            // next fragment(s).
+
+            // TODO buffer.array() doesn't work if MessageBuffer is allocated by
+            //      newDirectBuffer. dd copy method to MessageBuffer to solve this issue.
+
+            int off = 0;
+            if (remaining > 0) {
+                numberBuffer.putBytes(0,
+                        buffer.array(), buffer.arrayOffset() + position,
+                        remaining);
+                readLength -= remaining;
+                off += remaining;
+            }
 
-            numberBuffer.putBytes(remaining,
-                                  next.array(), next.arrayOffset(),
-                                  readLength - remaining);
+            while (true) {
+                nextBuffer();
+                int nextSize = buffer.size();
+                if (nextSize >= readLength) {
+                    numberBuffer.putBytes(off,
+                            buffer.array(), buffer.arrayOffset(),
+                            readLength);
+                    position = readLength;
+                    break;
+                }
+                else {
+                    numberBuffer.putBytes(off,
+                            buffer.array(), buffer.arrayOffset(),
+                            nextSize);
+                    readLength -= nextSize;
+                    off += nextSize;
+                }
+            }
 
-            buffer = next;
-            position = readLength - remaining;
             nextReadPosition = 0;
-
-            return numberBuffer; // Return the numberBuffer
+            return numberBuffer;
         }
     }
 
diff --git a/msgpack-core/src/test/scala/org/msgpack/core/MessageUnpackerTest.scala b/msgpack-core/src/test/scala/org/msgpack/core/MessageUnpackerTest.scala
index 033ee86b7..33eecffbb 100644
--- a/msgpack-core/src/test/scala/org/msgpack/core/MessageUnpackerTest.scala
+++ b/msgpack-core/src/test/scala/org/msgpack/core/MessageUnpackerTest.scala
@@ -16,17 +16,33 @@
 package org.msgpack.core
 
 import java.io._
-import java.nio.ByteBuffer
 
 import org.msgpack.core.buffer._
 import org.msgpack.value.ValueType
-import xerial.core.io.IOUtil
+import xerial.core.io.IOUtil._
 
 import scala.util.Random
 
-/**
- * Created on 2014/05/07.
- */
+object MessageUnpackerTest {
+  class SplitMessageBufferInput(array: Array[Array[Byte]]) extends MessageBufferInput {
+    var cursor = 0
+    override def next(): MessageBuffer = {
+      if (cursor < array.length) {
+        val a = array(cursor)
+        cursor += 1
+        MessageBuffer.wrap(a)
+      }
+      else {
+        null
+      }
+    }
+
+    override def close(): Unit = {}
+  }
+}
+
+import MessageUnpackerTest._
+
 class MessageUnpackerTest extends MessagePackSpec {
 
   def testData: Array[Byte] = {
@@ -246,21 +262,6 @@ class MessageUnpackerTest extends MessagePackSpec {
 
     }
 
-    class SplitMessageBufferInput(array: Array[Array[Byte]]) extends MessageBufferInput {
-      var cursor = 0
-      override def next(): MessageBuffer = {
-        if (cursor < array.length) {
-          val a = array(cursor)
-          cursor += 1
-          MessageBuffer.wrap(a)
-        }
-        else {
-          null
-        }
-      }
-
-      override def close(): Unit = {}
-    }
 
     "read data at the buffer boundary" taggedAs ("boundary") in {
 
@@ -587,7 +588,7 @@ class MessageUnpackerTest extends MessagePackSpec {
       val N = 1000
       val t = time("unpacker", repeat = 10) {
         block("no-buffer-reset") {
-          IOUtil.withResource(MessagePack.newDefaultUnpacker(arr)) { unpacker =>
+          withResource(MessagePack.newDefaultUnpacker(arr)) { unpacker =>
             for (i <- 0 until N) {
               val buf = new ArrayBufferInput(arr)
               unpacker.reset(buf)
@@ -598,7 +599,7 @@ class MessageUnpackerTest extends MessagePackSpec {
         }
 
         block("reuse-array-input") {
-          IOUtil.withResource(MessagePack.newDefaultUnpacker(arr)) { unpacker =>
+          withResource(MessagePack.newDefaultUnpacker(arr)) { unpacker =>
             val buf = new ArrayBufferInput(arr)
             for (i <- 0 until N) {
               buf.reset(arr)
@@ -610,7 +611,7 @@ class MessageUnpackerTest extends MessagePackSpec {
         }
 
         block("reuse-message-buffer") {
-          IOUtil.withResource(MessagePack.newDefaultUnpacker(arr)) { unpacker =>
+          withResource(MessagePack.newDefaultUnpacker(arr)) { unpacker =>
             val buf = new ArrayBufferInput(arr)
             for (i <- 0 until N) {
               buf.reset(mb)
@@ -703,5 +704,32 @@ class MessageUnpackerTest extends MessagePackSpec {
         Seq(8185, 8186, 8187, 8188, 16377, 16378, 16379, 16380).foreach { n => check(s, n)}
       }
     }
+
+    def readTest(input:MessageBufferInput): Unit = {
+      withResource(MessagePack.newDefaultUnpacker(input)) { unpacker =>
+        while (unpacker.hasNext) {
+          unpacker.unpackValue()
+        }
+      }
+    }
+
+    "read value length at buffer boundary" taggedAs("number-boundary") in {
+      val input = new SplitMessageBufferInput(Array(
+        Array[Byte](MessagePack.Code.STR16),
+        Array[Byte](0x00),
+        Array[Byte](0x05), // STR16 length at the boundary
+        "hello".getBytes(MessagePack.UTF8))
+      )
+      readTest(input)
+
+      val input2 = new SplitMessageBufferInput(Array(
+        Array[Byte](MessagePack.Code.STR32),
+        Array[Byte](0x00),
+        Array[Byte](0x00, 0x00),
+        Array[Byte](0x05), // STR32 length at the boundary
+        "hello".getBytes(MessagePack.UTF8))
+      )
+      readTest(input2)
+    }
   }
 }