diff --git a/test/scenario/video_stream.cc b/test/scenario/video_stream.cc
index f7d26cebd1..46852d8c99 100644
--- a/test/scenario/video_stream.cc
+++ b/test/scenario/video_stream.cc
@@ -214,11 +214,12 @@ VideoEncoderConfig CreateVideoEncoderConfig(VideoStreamConfig config) {
   encoder_config.video_format =
       SdpVideoFormat(CodecTypeToPayloadString(config.encoder.codec), {});
 
-  size_t num_streams = 1;
+  encoder_config.number_of_streams = 1;
   if (config.encoder.codec == VideoStreamConfig::Encoder::Codec::kVideoCodecVP8)
-    num_streams = static_cast<size_t>(config.encoder.layers.spatial);
-  encoder_config.number_of_streams = num_streams;
-  encoder_config.simulcast_layers = std::vector<VideoStream>(num_streams);
+    encoder_config.number_of_streams =
+        static_cast<size_t>(config.encoder.layers.spatial);
+  encoder_config.simulcast_layers =
+      std::vector<VideoStream>(config.encoder.layers.spatial);
   encoder_config.min_transmit_bitrate_bps = config.stream.pad_to_rate.bps();
 
   std::string cricket_codec = CodecTypeToCodecName(config.encoder.codec);
@@ -446,6 +447,23 @@ void SendVideoStream::UpdateConfig(
   });
 }
 
+void SendVideoStream::UpdateActiveLayers(std::vector<bool> active_layers) {
+  sender_->task_queue_.PostTask([=] {
+    rtc::CritScope cs(&crit_);
+    if (config_.encoder.codec ==
+        VideoStreamConfig::Encoder::Codec::kVideoCodecVP8) {
+      send_stream_->UpdateActiveSimulcastLayers(active_layers);
+    } else {
+      VideoEncoderConfig encoder_config = CreateVideoEncoderConfig(config_);
+      RTC_CHECK_EQ(encoder_config.simulcast_layers.size(),
+                   active_layers.size());
+      for (size_t i = 0; i < encoder_config.simulcast_layers.size(); ++i)
+        encoder_config.simulcast_layers[i].active = active_layers[i];
+      send_stream_->ReconfigureVideoEncoder(std::move(encoder_config));
+    }
+  });
+}
+
 void SendVideoStream::SetCaptureFramerate(int framerate) {
   sender_->SendTask([&] { video_capturer_->ChangeFramerate(framerate); });
 }
diff --git a/test/scenario/video_stream.h b/test/scenario/video_stream.h
index cac5861011..ef98679963 100644
--- a/test/scenario/video_stream.h
+++ b/test/scenario/video_stream.h
@@ -39,6 +39,7 @@ class SendVideoStream {
   void Start();
   void Stop();
   void UpdateConfig(std::function<void(VideoStreamConfig*)> modifier);
+  void UpdateActiveLayers(std::vector<bool> active_layers);
 
  private:
   friend class Scenario;