diff --git a/src/private/pack_p.cpp b/src/private/pack_p.cpp
index 7e759d1..382b541 100644
--- a/src/private/pack_p.cpp
+++ b/src/private/pack_p.cpp
@@ -15,7 +15,10 @@ bool MsgPackPrivate::compatibilityMode = false;
 quint8 *MsgPackPrivate::pack(const QVariant &v, quint8 *p, bool wr)
 {
     QMetaType::Type t = (QMetaType::Type)v.type();
-    if (t == QMetaType::Int)
+
+    if (v.isNull())
+        p = pack_nil(p, wr);
+    else if (t == QMetaType::Int)
         p = pack_int(v.toInt(), p, wr);
     else if (t == QMetaType::UInt)
         p = pack_uint(v.toUInt(), p, wr);
@@ -47,6 +50,13 @@ quint8 *MsgPackPrivate::pack(const QVariant &v, quint8 *p, bool wr)
     return p;
 }
 
+quint8 *MsgPackPrivate::pack_nil(quint8 *p, bool wr)
+{
+    if (wr)
+        *p = 0xc0;
+    return p + 1;
+}
+
 quint8 *MsgPackPrivate::pack_int(qint32 i, quint8 *p, bool wr)
 {
     if (i >= -32 && i <= 127) {
diff --git a/src/private/pack_p.h b/src/private/pack_p.h
index b29f971..6d12f53 100644
--- a/src/private/pack_p.h
+++ b/src/private/pack_p.h
@@ -23,6 +23,7 @@ extern bool compatibilityMode;
 
 quint8 * pack(const QVariant &v, quint8 *p, bool wr);
 
+quint8 * pack_nil(quint8 *p, bool wr);
 quint8 * pack_int(qint32 i, quint8 *p, bool wr);
 quint8 * pack_uint(quint32 i, quint8 *p, bool wr);
 quint8 * pack_longlong(qint64 i, quint8 *p, bool wr);
diff --git a/tests/pack/pack_test.cpp b/tests/pack/pack_test.cpp
index 70b2963..5c208ba 100644
--- a/tests/pack/pack_test.cpp
+++ b/tests/pack/pack_test.cpp
@@ -9,6 +9,7 @@ class PackTest : public QObject
     Q_OBJECT
 
 private Q_SLOTS:
+    void test_nil();
     void test_bool();
     void test_fixint();
     void test_integer8();
@@ -21,6 +22,14 @@ private Q_SLOTS:
     void test_array();
 };
 
+void PackTest::test_nil()
+{
+    QByteArray arr = MsgPack::pack(QVariant());
+    quint8 *p = (quint8 *)arr.data();
+    QVERIFY(arr.size() == 1);
+    QVERIFY(p[0] == 0xc0);
+}
+
 void PackTest::test_bool()
 {
     QByteArray arr = MsgPack::pack(false);
diff --git a/tests/unpack/unpack_test.cpp b/tests/unpack/unpack_test.cpp
index 10e8c48..02c91ab 100644
--- a/tests/unpack/unpack_test.cpp
+++ b/tests/unpack/unpack_test.cpp
@@ -9,6 +9,7 @@ class UnpackTest : public QObject
     Q_OBJECT
 
 private Q_SLOTS:
+    void test_nil();
     void test_booleans();
     void test_integers();
     void test_floats();
@@ -17,6 +18,13 @@ private Q_SLOTS:
     void test_array();
 };
 
+void UnpackTest::test_nil()
+{
+    QByteArray pack = MsgPack::pack(QVariantList() << true << QVariant());
+    QVariantList u = MsgPack::unpack(pack).toList();
+    QVERIFY(u[0] == true);
+    QVERIFY(u[1].isNull());
+}
 
 void UnpackTest::test_booleans()
 {