diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index 9d813b1881..00bcc3e545 100755
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -20,6 +20,7 @@ CPPLINT_DIRS = [
   'webrtc/call',
   'webrtc/common_video',
   'webrtc/examples',
+  'webrtc/modules/audio_mixer',
   'webrtc/modules/bitrate_controller',
   'webrtc/modules/congestion_controller',
   'webrtc/modules/pacing',
diff --git a/webrtc/modules/audio_mixer/source/new_audio_conference_mixer_impl.h b/webrtc/modules/audio_mixer/source/new_audio_conference_mixer_impl.h
index a6a3deac14..3d41373b43 100644
--- a/webrtc/modules/audio_mixer/source/new_audio_conference_mixer_impl.h
+++ b/webrtc/modules/audio_mixer/source/new_audio_conference_mixer_impl.h
@@ -14,6 +14,7 @@
 #include <list>
 #include <map>
 #include <memory>
+#include <vector>
 
 #include "webrtc/base/thread_checker.h"
 #include "webrtc/engine_configurations.h"