diff --git a/src/modules/audio_device/main/source/mac/audio_device_utility_mac.cc b/src/modules/audio_device/main/source/mac/audio_device_utility_mac.cc
new file mode 100644
index 0000000000..cc56bfb1d6
--- /dev/null
+++ b/src/modules/audio_device/main/source/mac/audio_device_utility_mac.cc
@@ -0,0 +1,56 @@
+/*
+ *  Copyright (c) 2011 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 "audio_device_utility_mac.h"
+#include "audio_device_config.h"    // DEBUG_PRINT()
+#include "critical_section_wrapper.h"
+#include "trace.h"
+
+namespace webrtc
+{
+
+AudioDeviceUtilityMac::AudioDeviceUtilityMac(const WebRtc_Word32 id) :
+    _critSect(*CriticalSectionWrapper::CreateCriticalSection()),
+    _id(id),
+    _lastError(AudioDeviceModule::kAdmErrNone)
+{
+    WEBRTC_TRACE(kTraceMemory, kTraceAudioDevice, id,
+                 "%s created", __FUNCTION__);
+}
+
+// ----------------------------------------------------------------------------
+//  AudioDeviceUtilityMac() - dtor
+// ----------------------------------------------------------------------------
+
+AudioDeviceUtilityMac::~AudioDeviceUtilityMac()
+{
+    WEBRTC_TRACE(kTraceMemory, kTraceAudioDevice, _id,
+                 "%s destroyed", __FUNCTION__);
+    {
+        CriticalSectionScoped lock(_critSect);
+
+        // free stuff here...
+    }
+
+    delete &_critSect;
+}
+
+WebRtc_Word32 AudioDeviceUtilityMac::Init()
+{
+    WEBRTC_TRACE(kTraceModuleCall, kTraceAudioDevice, _id,
+                 "%s", __FUNCTION__);
+
+    WEBRTC_TRACE(kTraceStateInfo, kTraceAudioDevice, _id,
+                 "  OS info: %s", "OS X");
+
+    return 0;
+}
+
+} //  namespace webrtc