diff --git a/modules/rtp_rtcp/BUILD.gn b/modules/rtp_rtcp/BUILD.gn
index 950e832616..00431dc097 100644
--- a/modules/rtp_rtcp/BUILD.gn
+++ b/modules/rtp_rtcp/BUILD.gn
@@ -378,6 +378,7 @@ rtc_library("rtcp_transceiver") {
     "../../api/video:video_bitrate_allocation",
     "../../rtc_base:checks",
     "../../rtc_base:rtc_base_approved",
+    "../../rtc_base/containers:flat_map",
     "../../rtc_base/task_utils:repeating_task",
     "../../rtc_base/task_utils:to_queued_task",
     "../../system_wrappers",
diff --git a/modules/rtp_rtcp/source/rtcp_transceiver_impl.h b/modules/rtp_rtcp/source/rtcp_transceiver_impl.h
index 91dc496faf..b03db7d786 100644
--- a/modules/rtp_rtcp/source/rtcp_transceiver_impl.h
+++ b/modules/rtp_rtcp/source/rtcp_transceiver_impl.h
@@ -25,6 +25,7 @@
 #include "modules/rtp_rtcp/source/rtcp_packet/report_block.h"
 #include "modules/rtp_rtcp/source/rtcp_packet/target_bitrate.h"
 #include "modules/rtp_rtcp/source/rtcp_transceiver_config.h"
+#include "rtc_base/containers/flat_map.h"
 #include "rtc_base/task_utils/repeating_task.h"
 #include "system_wrappers/include/ntp_time.h"
 
@@ -118,7 +119,7 @@ class RtcpTransceiverImpl {
   absl::optional<rtcp::Remb> remb_;
   // TODO(danilchap): Remove entries from remote_senders_ that are no longer
   // needed.
-  std::map<uint32_t, RemoteSenderState> remote_senders_;
+  flat_map<uint32_t, RemoteSenderState> remote_senders_;
   RepeatingTaskHandle periodic_task_handle_;
 };