diff --git a/media/engine/simulcast.cc b/media/engine/simulcast.cc
index 5b62e52dbc..b7db9bc2c1 100644
--- a/media/engine/simulcast.cc
+++ b/media/engine/simulcast.cc
@@ -183,7 +183,8 @@ int GetTotalMaxBitrateBps(const std::vector<webrtc::VideoStream>& layers) {
 }
 
 int LimitSimulcastLayerCount(int width, int height, int layer_count) {
-  if (webrtc::field_trial::IsEnabled(kUseLegacySimulcastLayerLimitFieldTrial)) {
+  if (!webrtc::field_trial::IsDisabled(
+          kUseLegacySimulcastLayerLimitFieldTrial)) {
     int adaptive_layer_count =
         kSimulcastFormats[FindSimulcastFormatIndex(width, height)].max_layers;
     if (layer_count > adaptive_layer_count) {
diff --git a/media/engine/simulcast_unittest.cc b/media/engine/simulcast_unittest.cc
index d16eab1268..402a556ac6 100644
--- a/media/engine/simulcast_unittest.cc
+++ b/media/engine/simulcast_unittest.cc
@@ -140,20 +140,22 @@ TEST(SimulcastTest, GetConfigWithLimitedMaxLayers) {
 }
 
 TEST(SimulcastTest, GetConfigWithLimitedMaxLayersForResolution) {
+  test::ScopedFieldTrials field_trials(
+      "WebRTC-LegacySimulcastLayerLimit/Enabled/");
   const size_t kMaxLayers = 3;
   std::vector<VideoStream> streams = cricket::GetSimulcastConfig(
       kMaxLayers, 800, 600, kBitratePriority, kQpMax, !kScreenshare);
 
-  EXPECT_EQ(3u, streams.size());
-  EXPECT_EQ(200u, streams[0].width);
-  EXPECT_EQ(150u, streams[0].height);
-  EXPECT_EQ(400u, streams[1].width);
-  EXPECT_EQ(300u, streams[1].height);
-  EXPECT_EQ(800u, streams[2].width);
-  EXPECT_EQ(600u, streams[2].height);
+  EXPECT_EQ(2u, streams.size());
+  EXPECT_EQ(400u, streams[0].width);
+  EXPECT_EQ(300u, streams[0].height);
+  EXPECT_EQ(800u, streams[1].width);
+  EXPECT_EQ(600u, streams[1].height);
 }
 
 TEST(SimulcastTest, GetConfigWithNotLimitedMaxLayersForResolution) {
+  test::ScopedFieldTrials field_trials(
+      "WebRTC-LegacySimulcastLayerLimit/Disabled/");
   const size_t kMaxLayers = 3;
   std::vector<VideoStream> streams = cricket::GetSimulcastConfig(
       kMaxLayers, 800, 600, kBitratePriority, kQpMax, !kScreenshare);