diff --git a/webrtc/video_engine/include/vie_capture.h b/webrtc/video_engine/include/vie_capture.h
index bcae930bf4..2174d5dc6f 100644
--- a/webrtc/video_engine/include/vie_capture.h
+++ b/webrtc/video_engine/include/vie_capture.h
@@ -114,7 +114,6 @@ class WEBRTC_DLLEXPORT ViEExternalCapture {
   // This method is specifically for delivering a new captured I420 frame to
   // VideoEngine.
   // |capture_time| must be specified in the NTP time format in milliseconds.
-  // This method uses an internal buffer and must be called sequentially.
   virtual int IncomingFrameI420(
       const ViEVideoFrameI420& video_frame,
       unsigned long long capture_time = 0) = 0;
diff --git a/webrtc/video_engine/vie_capturer.cc b/webrtc/video_engine/vie_capturer.cc
index c5844e2293..d7e33e77db 100644
--- a/webrtc/video_engine/vie_capturer.cc
+++ b/webrtc/video_engine/vie_capturer.cc
@@ -43,6 +43,7 @@ ViECapturer::ViECapturer(int capture_id,
       external_capture_module_(NULL),
       module_process_thread_(module_process_thread),
       capture_id_(capture_id),
+      incoming_frame_cs_(CriticalSectionWrapper::CreateCriticalSection()),
       capture_thread_(*ThreadWrapper::CreateThread(ViECaptureThreadFunction,
                                                    this, kHighPriority,
                                                    "ViECaptureThread")),
@@ -332,7 +333,8 @@ int ViECapturer::IncomingFrameI420(const ViEVideoFrameI420& video_frame,
   int size_y = video_frame.height * video_frame.y_pitch;
   int size_u = video_frame.u_pitch * ((video_frame.height + 1) / 2);
   int size_v = video_frame.v_pitch * ((video_frame.height + 1) / 2);
-  int ret = capture_frame_.CreateFrame(size_y,
+  CriticalSectionScoped cs(incoming_frame_cs_.get());
+  int ret = incoming_frame_.CreateFrame(size_y,
                                        video_frame.y_plane,
                                        size_u,
                                        video_frame.u_plane,
@@ -352,7 +354,7 @@ int ViECapturer::IncomingFrameI420(const ViEVideoFrameI420& video_frame,
     return -1;
   }
 
-  return external_capture_module_->IncomingI420VideoFrame(&capture_frame_,
+  return external_capture_module_->IncomingI420VideoFrame(&incoming_frame_,
                                                           capture_time);
 }
 
diff --git a/webrtc/video_engine/vie_capturer.h b/webrtc/video_engine/vie_capturer.h
index 7900e55cf7..e47700f82f 100644
--- a/webrtc/video_engine/vie_capturer.h
+++ b/webrtc/video_engine/vie_capturer.h
@@ -157,6 +157,10 @@ class ViECapturer
   ProcessThread& module_process_thread_;
   const int capture_id_;
 
+  // Frame used in IncomingFrameI420.
+  scoped_ptr<CriticalSectionWrapper> incoming_frame_cs_;
+  I420VideoFrame incoming_frame_;
+
   // Capture thread.
   ThreadWrapper& capture_thread_;
   EventWrapper& capture_event_;
@@ -181,8 +185,6 @@ class ViECapturer
 
   CaptureCapability requested_capability_;
 
-  I420VideoFrame capture_frame_;
-
   scoped_ptr<OveruseFrameDetector> overuse_detector_;
 };