diff --git a/audio/BUILD.gn b/audio/BUILD.gn
index 56b974d..ea6b9d2 100644
--- a/audio/BUILD.gn
+++ b/audio/BUILD.gn
@@ -92,6 +92,7 @@
     "../rtc_base:rtc_task_queue",
     "../rtc_base:safe_minmax",
     "../rtc_base:threading",
+    "../rtc_base/containers:flat_set",
     "../rtc_base/experiments:field_trial_parser",
     "../rtc_base/synchronization:mutex",
     "../rtc_base/system:no_unique_address",
diff --git a/audio/audio_state.h b/audio/audio_state.h
index 89c748d..55f3551 100644
--- a/audio/audio_state.h
+++ b/audio/audio_state.h
@@ -13,12 +13,12 @@
 
 #include <map>
 #include <memory>
-#include <unordered_set>
 
 #include "api/sequence_checker.h"
 #include "audio/audio_transport_impl.h"
 #include "audio/null_audio_poller.h"
 #include "call/audio_state.h"
+#include "rtc_base/containers/flat_set.h"
 #include "rtc_base/ref_count.h"
 
 namespace webrtc {
@@ -80,7 +80,7 @@
   // stats are still updated.
   std::unique_ptr<NullAudioPoller> null_audio_poller_;
 
-  std::unordered_set<webrtc::AudioReceiveStream*> receiving_streams_;
+  webrtc::flat_set<webrtc::AudioReceiveStream*> receiving_streams_;
   struct StreamProperties {
     int sample_rate_hz = 0;
     size_t num_channels = 0;