diff --git a/webrtc/modules/remote_bitrate_estimator/test/estimators/send_side.cc b/webrtc/modules/remote_bitrate_estimator/test/estimators/send_side.cc
index 111521ea2e..2fa60a104c 100644
--- a/webrtc/modules/remote_bitrate_estimator/test/estimators/send_side.cc
+++ b/webrtc/modules/remote_bitrate_estimator/test/estimators/send_side.cc
@@ -28,7 +28,8 @@ FullBweSender::FullBweSender(int kbps, BitrateObserver* observer, Clock* clock)
       clock_(clock),
       send_time_history_(clock_, 10000),
       has_received_ack_(false),
-      last_acked_seq_num_(0) {
+      last_acked_seq_num_(0),
+      last_log_time_ms_(0) {
   assert(kbps >= kMinBitrateKbps);
   assert(kbps <= kMaxBitrateKbps);
   bitrate_controller_->SetStartBitrate(1000 * kbps);
@@ -52,7 +53,11 @@ void FullBweSender::GiveFeedback(const FeedbackPacket& feedback) {
   std::vector<PacketInfo> packet_feedback_vector(fb.packet_feedback_vector());
   for (PacketInfo& packet_info : packet_feedback_vector) {
     if (!send_time_history_.GetInfo(&packet_info, true)) {
-      LOG(LS_WARNING) << "Ack arrived too late.";
+      int64_t now_ms = clock_->TimeInMilliseconds();
+      if (now_ms - last_log_time_ms_ > 5000) {
+        LOG(LS_WARNING) << "Ack arrived too late.";
+        last_log_time_ms_ = now_ms;
+      }
     }
   }
 
diff --git a/webrtc/modules/remote_bitrate_estimator/test/estimators/send_side.h b/webrtc/modules/remote_bitrate_estimator/test/estimators/send_side.h
index 51e29e34c2..ca7f6dbddc 100644
--- a/webrtc/modules/remote_bitrate_estimator/test/estimators/send_side.h
+++ b/webrtc/modules/remote_bitrate_estimator/test/estimators/send_side.h
@@ -45,6 +45,7 @@ class FullBweSender : public BweSender, public RemoteBitrateObserver {
   SendTimeHistory send_time_history_;
   bool has_received_ack_;
   uint16_t last_acked_seq_num_;
+  int64_t last_log_time_ms_;
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(FullBweSender);
 };