diff --git a/webrtc/common_audio/signal_processing/signal_processing.gypi b/webrtc/common_audio/signal_processing/signal_processing.gypi
index 929569db4c..f6c6e73518 100644
--- a/webrtc/common_audio/signal_processing/signal_processing.gypi
+++ b/webrtc/common_audio/signal_processing/signal_processing.gypi
@@ -85,6 +85,8 @@
           ],
         }],
       ],
+      # Ignore warning on shift operator promotion.
+      'msvs_disabled_warnings': [ 4334, ],
     }, # spl
   ], # targets
   'conditions': [
diff --git a/webrtc/common_audio/signal_processing/spl_init.c b/webrtc/common_audio/signal_processing/spl_init.c
index db21e40434..5d243bb8d5 100644
--- a/webrtc/common_audio/signal_processing/spl_init.c
+++ b/webrtc/common_audio/signal_processing/spl_init.c
@@ -100,7 +100,7 @@ static void once(void (*func)(void)) {
    * InterlockedCompareExchangePointer) to avoid issues similar to
    * http://code.google.com/p/webm/issues/detail?id=467.
    */
-  static CRITICAL_SECTION lock = {(void *)-1, -1, 0, 0, 0, 0};
+  static CRITICAL_SECTION lock = {(void *)((size_t)-1), -1, 0, 0, 0, 0};
   static int done = 0;
 
   EnterCriticalSection(&lock);
diff --git a/webrtc/common_video/common_video.gyp b/webrtc/common_video/common_video.gyp
index d8f2a3f569..36e2ee5b0c 100644
--- a/webrtc/common_video/common_video.gyp
+++ b/webrtc/common_video/common_video.gyp
@@ -66,6 +66,8 @@
         'plane.h',
         'plane.cc',
       ],
+      # Silence jpeg struct padding warnings.
+      'msvs_disabled_warnings': [ 4324, ],
     },
   ],  # targets
   'conditions': [
diff --git a/webrtc/modules/audio_processing/audio_processing.gypi b/webrtc/modules/audio_processing/audio_processing.gypi
index a9d8438e05..5ca1cc20e9 100644
--- a/webrtc/modules/audio_processing/audio_processing.gypi
+++ b/webrtc/modules/audio_processing/audio_processing.gypi
@@ -122,6 +122,8 @@
           'dependencies': ['audio_processing_neon',],
         }],
       ],
+      # TODO(jschuh): Bug 1348: fix size_t to int truncations.
+      'msvs_disabled_warnings': [ 4267, ],
     },
   ],
   'conditions': [
diff --git a/webrtc/modules/bitrate_controller/bitrate_controller.gypi b/webrtc/modules/bitrate_controller/bitrate_controller.gypi
index a8ca938de8..03334bd37b 100644
--- a/webrtc/modules/bitrate_controller/bitrate_controller.gypi
+++ b/webrtc/modules/bitrate_controller/bitrate_controller.gypi
@@ -30,6 +30,8 @@
         'send_side_bandwidth_estimation.cc',
         'send_side_bandwidth_estimation.h',
       ],
+      # TODO(jschuh): Bug 1348: fix size_t to int truncations.
+      'msvs_disabled_warnings': [ 4267, ],
     },
   ], # targets
 
diff --git a/webrtc/modules/media_file/source/media_file.gypi b/webrtc/modules/media_file/source/media_file.gypi
index 084a0235bd..797657a0ca 100644
--- a/webrtc/modules/media_file/source/media_file.gypi
+++ b/webrtc/modules/media_file/source/media_file.gypi
@@ -38,6 +38,8 @@
         'media_file_utility.cc',
         'media_file_utility.h',
       ], # source
+      # TODO(jschuh): Bug 1348: fix size_t to int truncations.
+      'msvs_disabled_warnings': [ 4267, ],
     },
   ], # targets
   'conditions': [
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_rtcp.gypi b/webrtc/modules/rtp_rtcp/source/rtp_rtcp.gypi
index 41305a6840..83e320f91c 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_rtcp.gypi
+++ b/webrtc/modules/rtp_rtcp/source/rtp_rtcp.gypi
@@ -91,6 +91,8 @@
         # Mocks
         '../mocks/mock_rtp_rtcp.h',
       ], # source
+      # TODO(jschuh): Bug 1348: fix size_t to int truncations.
+      'msvs_disabled_warnings': [ 4267, ],
     },
   ],
 }
diff --git a/webrtc/system_wrappers/source/system_wrappers.gyp b/webrtc/system_wrappers/source/system_wrappers.gyp
index 70ed50213a..b0903b2d02 100644
--- a/webrtc/system_wrappers/source/system_wrappers.gyp
+++ b/webrtc/system_wrappers/source/system_wrappers.gyp
@@ -187,6 +187,8 @@
           ],
         }],
       ],
+      # Ignore warning on shift operator promotion.
+      'msvs_disabled_warnings': [ 4334, ],
     },
   ], # targets
   'conditions': [
diff --git a/webrtc/video_engine/video_engine_core.gypi b/webrtc/video_engine/video_engine_core.gypi
index 4956b4d07b..8f28ef6afa 100644
--- a/webrtc/video_engine/video_engine_core.gypi
+++ b/webrtc/video_engine/video_engine_core.gypi
@@ -137,6 +137,8 @@
         'vie_sender.cc',
         'vie_sync_module.cc',
       ], # source
+      # TODO(jschuh): Bug 1348: fix size_t to int truncations.
+      'msvs_disabled_warnings': [ 4267, ],
     },
   ], # targets
   'conditions': [