diff --git a/webrtc/modules/desktop_capture/shared_memory.cc b/webrtc/modules/desktop_capture/shared_memory.cc
new file mode 100644
index 0000000..872116e
--- /dev/null
+++ b/webrtc/modules/desktop_capture/shared_memory.cc
@@ -0,0 +1,28 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/modules/desktop_capture/shared_memory.h"
+
+namespace webrtc {
+
+#if defined(WEBRTC_WIN)
+const SharedMemory::Handle SharedMemory::kInvalidHandle = NULL;
+#else
+const SharedMemory::Handle SharedMemory::kInvalidHandle = -1;
+#endif
+
+SharedMemory::SharedMemory(void* data, size_t size, Handle handle, int id)
+  : data_(data),
+    size_(size),
+    handle_(handle),
+    id_(id) {
+}
+
+}  // namespace webrtc