diff --git a/media/engine/simulcast_encoder_adapter.cc b/media/engine/simulcast_encoder_adapter.cc
index 4a53b80..e7f6205 100644
--- a/media/engine/simulcast_encoder_adapter.cc
+++ b/media/engine/simulcast_encoder_adapter.cc
@@ -771,6 +771,7 @@
   codec_params.maxFramerate = stream_params.maxFramerate;
   codec_params.qpMax = stream_params.qpMax;
   codec_params.active = stream_params.active;
+  codec_params.SetScalabilityMode(stream_params.GetScalabilityMode());
   // Settings that are based on stream/resolution.
   if (is_lowest_quality_stream) {
     // Settings for lowest spatial resolutions.
diff --git a/media/engine/simulcast_encoder_adapter_unittest.cc b/media/engine/simulcast_encoder_adapter_unittest.cc
index 1962a59..e0e3ea8 100644
--- a/media/engine/simulcast_encoder_adapter_unittest.cc
+++ b/media/engine/simulcast_encoder_adapter_unittest.cc
@@ -1777,5 +1777,24 @@
             adapter_->InitEncode(&codec_, kSettings));
 }
 
+TEST_F(TestSimulcastEncoderAdapterFake, PopulatesScalabilityModeOfSubcodecs) {
+  SimulcastTestFixtureImpl::DefaultSettings(
+      &codec_, static_cast<const int*>(kTestTemporalLayerProfile),
+      kVideoCodecVP8);
+  codec_.numberOfSimulcastStreams = 3;
+  codec_.simulcastStream[0].numberOfTemporalLayers = 1;
+  codec_.simulcastStream[1].numberOfTemporalLayers = 2;
+  codec_.simulcastStream[2].numberOfTemporalLayers = 3;
+
+  EXPECT_EQ(0, adapter_->InitEncode(&codec_, kSettings));
+  ASSERT_EQ(3u, helper_->factory()->encoders().size());
+  EXPECT_EQ(helper_->factory()->encoders()[0]->codec().GetScalabilityMode(),
+            ScalabilityMode::kL1T1);
+  EXPECT_EQ(helper_->factory()->encoders()[1]->codec().GetScalabilityMode(),
+            ScalabilityMode::kL1T2);
+  EXPECT_EQ(helper_->factory()->encoders()[2]->codec().GetScalabilityMode(),
+            ScalabilityMode::kL1T3);
+}
+
 }  // namespace test
 }  // namespace webrtc