diff --git a/api/video_codecs/simulcast_stream.h b/api/video_codecs/simulcast_stream.h
index 78976b34a0..7d94ae37a7 100644
--- a/api/video_codecs/simulcast_stream.h
+++ b/api/video_codecs/simulcast_stream.h
@@ -18,7 +18,7 @@ namespace webrtc {
 
 // TODO(bugs.webrtc.org/6883): Unify with struct VideoStream, part of
 // VideoEncoderConfig.
-struct SimulcastStream {
+struct RTC_EXPORT SimulcastStream {
   // Temporary utility methods for transition from numberOfTemporalLayers
   // setting to ScalabilityMode.
   unsigned char GetNumberOfTemporalLayers() const;