diff --git a/modules/audio_device/mac/audio_device_mac.cc b/modules/audio_device/mac/audio_device_mac.cc
index ed7b0e4669..f64d4313c6 100644
--- a/modules/audio_device/mac/audio_device_mac.cc
+++ b/modules/audio_device/mac/audio_device_mac.cc
@@ -15,6 +15,7 @@
 #include <sys/sysctl.h>  // sysctlbyname()
 
 #include <memory>
+#include <vector>
 
 #include "modules/audio_device/audio_device_config.h"
 #include "modules/third_party/portaudio/pa_ringbuffer.h"
@@ -2428,7 +2429,7 @@ bool AudioDeviceMac::CaptureWorkerThread() {
   OSStatus err = noErr;
   UInt32 noRecSamples =
       ENGINE_REC_BUF_SIZE_IN_SAMPLES * _inDesiredFormat.mChannelsPerFrame;
-  SInt16 recordBuffer[noRecSamples];
+  std::vector<SInt16> recordBuffer(noRecSamples);
   UInt32 size = ENGINE_REC_BUF_SIZE_IN_SAMPLES;
 
   AudioBufferList engineBuffer;
@@ -2436,7 +2437,7 @@ bool AudioDeviceMac::CaptureWorkerThread() {
   engineBuffer.mBuffers->mNumberChannels = _inDesiredFormat.mChannelsPerFrame;
   engineBuffer.mBuffers->mDataByteSize =
       _inDesiredFormat.mBytesPerPacket * noRecSamples;
-  engineBuffer.mBuffers->mData = recordBuffer;
+  engineBuffer.mBuffers->mData = recordBuffer.data();
 
   err = AudioConverterFillComplexBuffer(_captureConverter, inConverterProc,
                                         this, &size, &engineBuffer, NULL);
@@ -2471,7 +2472,8 @@ bool AudioDeviceMac::CaptureWorkerThread() {
 
     // store the recorded buffer (no action will be taken if the
     // #recorded samples is not a full buffer)
-    _ptrAudioBuffer->SetRecordedBuffer((int8_t*)&recordBuffer, (uint32_t)size);
+    _ptrAudioBuffer->SetRecordedBuffer((int8_t*)recordBuffer.data(),
+                                       (uint32_t)size);
     _ptrAudioBuffer->SetVQEData(msecOnPlaySide, msecOnRecordSide);
     _ptrAudioBuffer->SetTypingStatus(KeyPressed());