diff --git a/mock_ppp_device_factory.cc b/mock_ppp_device_factory.cc
new file mode 100644
index 0000000..9f04625
--- /dev/null
+++ b/mock_ppp_device_factory.cc
@@ -0,0 +1,23 @@
+// Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "shill/mock_ppp_device_factory.h"
+
+namespace shill {
+
+namespace {
+
+base::LazyInstance<MockPPPDeviceFactory> g_mock_ppp_device_factory
+    = LAZY_INSTANCE_INITIALIZER;
+
+}  // namespace
+
+MockPPPDeviceFactory::MockPPPDeviceFactory() {}
+MockPPPDeviceFactory::~MockPPPDeviceFactory() {}
+
+MockPPPDeviceFactory *MockPPPDeviceFactory::GetInstance() {
+  return g_mock_ppp_device_factory.Pointer();
+}
+
+}  // namespace shill