diff --git a/mock_cellular.cc b/mock_cellular.cc
new file mode 100644
index 0000000..d19aab0
--- /dev/null
+++ b/mock_cellular.cc
@@ -0,0 +1,28 @@
+// Copyright (c) 2012 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_cellular.h"
+
+namespace shill {
+
+// TODO(rochberg): The cellular constructor does work.  Ought to fix
+// this so that we don't depend on passing real values in for Type.
+
+MockCellular::MockCellular(ControlInterface *control_interface,
+                           EventDispatcher *dispatcher,
+                           Metrics *metrics,
+                           Manager *manager,
+                           const std::string &link_name,
+                           const std::string &address,
+                           int interface_index,
+                           Type type,
+                           const std::string &owner,
+                           const std::string &path,
+                           mobile_provider_db *provider_db)
+    : Cellular(control_interface, dispatcher, metrics, manager, link_name,
+               address, interface_index, type, owner, path, provider_db) {}
+
+MockCellular::~MockCellular() {}
+
+}  // namespace shill