diff --git a/video/send_statistics_proxy.cc b/video/send_statistics_proxy.cc
index 8605771cd3..b857c0535b 100644
--- a/video/send_statistics_proxy.cc
+++ b/video/send_statistics_proxy.cc
@@ -977,8 +977,8 @@ void SendStatisticsProxy::OnSendEncodedImage(
   stats->frames_encoded++;
   stats->total_encode_time_ms += encoded_image.timing_.encode_finish_ms -
                                  encoded_image.timing_.encode_start_ms;
-  if (codec_info)
-    stats->scalability_mode = codec_info->scalability_mode;
+  stats->scalability_mode =
+      codec_info ? codec_info->scalability_mode : absl::nullopt;
   // Report resolution of the top spatial layer.
   bool is_top_spatial_layer =
       codec_info == nullptr || codec_info->end_of_picture;
@@ -1059,6 +1059,11 @@ void SendStatisticsProxy::OnEncoderImplementationChanged(
                          implementation.name};
   stats_.encoder_implementation_name = implementation.name;
   stats_.power_efficient_encoder = implementation.is_hardware_accelerated;
+  // Clear cached scalability mode values, they may no longer be accurate.
+  for (auto& pair : stats_.substreams) {
+    VideoSendStream::StreamStats& stream_stats = pair.second;
+    stream_stats.scalability_mode = absl::nullopt;
+  }
 }
 
 int SendStatisticsProxy::GetInputFrameRate() const {