diff --git a/webrtc/modules/remote_bitrate_estimator/test/bwe_test_framework.cc b/webrtc/modules/remote_bitrate_estimator/test/bwe_test_framework.cc
index 5608b2a814..4f05e0b42a 100644
--- a/webrtc/modules/remote_bitrate_estimator/test/bwe_test_framework.cc
+++ b/webrtc/modules/remote_bitrate_estimator/test/bwe_test_framework.cc
@@ -285,7 +285,8 @@ void RateCounterFilter::Plot(int64_t timestamp_ms) {
 void RateCounterFilter::RunFor(int64_t /*time_ms*/, Packets* in_out) {
   assert(in_out);
   for (const Packet* packet : *in_out) {
-    rate_counter_->UpdateRates(packet->send_time_us(), packet->payload_size());
+    rate_counter_->UpdateRates(packet->send_time_us(),
+                               static_cast<int>(packet->payload_size()));
   }
   packets_per_second_stats_.Push(rate_counter_->packets_per_second());
   kbps_stats_.Push(rate_counter_->bits_per_second() / 1000.0);
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 c890b6aa0f..d501868065 100644
--- a/webrtc/modules/remote_bitrate_estimator/test/estimators/send_side.cc
+++ b/webrtc/modules/remote_bitrate_estimator/test/estimators/send_side.cc
@@ -59,7 +59,8 @@ void FullBweSender::GiveFeedback(const FeedbackPacket& feedback) {
   // Assuming no reordering for now.
   if (expected_packets <= 0)
     return;
-  int lost_packets = expected_packets - fb.packet_feedback_vector().size();
+  int lost_packets =
+      expected_packets - static_cast<int>(fb.packet_feedback_vector().size());
   report_block_.fractionLost = (lost_packets << 8) / expected_packets;
   report_block_.cumulativeLost += lost_packets;
   ReportBlockList report_blocks;
diff --git a/webrtc/modules/remote_bitrate_estimator/test/packet_sender.cc b/webrtc/modules/remote_bitrate_estimator/test/packet_sender.cc
index 3c73d97989..e054560606 100644
--- a/webrtc/modules/remote_bitrate_estimator/test/packet_sender.cc
+++ b/webrtc/modules/remote_bitrate_estimator/test/packet_sender.cc
@@ -285,7 +285,7 @@ void TcpSender::SendPackets(Packets* in_out) {
   int packets_to_send = std::max(cwnd - in_flight_, 0);
   if (packets_to_send > 0) {
     Packets generated = GeneratePackets(packets_to_send);
-    in_flight_ += generated.size();
+    in_flight_ += static_cast<int>(generated.size());
     in_out->merge(generated, DereferencingComparator<Packet>);
   }
 }
@@ -295,7 +295,7 @@ void TcpSender::UpdateCongestionControl(const FeedbackPacket* fb) {
   DCHECK(!tcp_fb->acked_packets().empty());
   ack_received_ = true;
 
-  in_flight_ -= tcp_fb->acked_packets().size();
+  in_flight_ -= static_cast<int>(tcp_fb->acked_packets().size());
   DCHECK_GE(in_flight_, 0);
 
   if (LossEvent(tcp_fb->acked_packets())) {