diff --git a/modules/remote_bitrate_estimator/test/packet_sender.cc b/modules/remote_bitrate_estimator/test/packet_sender.cc
index 45854637c3..247b2e5fd6 100644
--- a/modules/remote_bitrate_estimator/test/packet_sender.cc
+++ b/modules/remote_bitrate_estimator/test/packet_sender.cc
@@ -13,6 +13,7 @@
 #include <assert.h>
 #include <math.h>
 #include <algorithm>
+#include <cmath>
 #include <limits>
 #include <list>
 #include <vector>
@@ -422,7 +423,7 @@ int TcpSender::GetFeedbackIntervalMs() const {
 }
 
 void TcpSender::SendPackets(Packets* in_out) {
-  int cwnd = ceil(cwnd_);
+  int cwnd = std::ceil(cwnd_);
   int packets_to_send = std::max(cwnd - static_cast<int>(in_flight_.size()), 0);
   int timed_out = TriggerTimeouts();
   if (timed_out > 0) {
diff --git a/rtc_tools/frame_analyzer/video_temporal_aligner.cc b/rtc_tools/frame_analyzer/video_temporal_aligner.cc
index d03ec61078..42017c4808 100644
--- a/rtc_tools/frame_analyzer/video_temporal_aligner.cc
+++ b/rtc_tools/frame_analyzer/video_temporal_aligner.cc
@@ -84,9 +84,9 @@ class DownscaledVideo : public rtc::RefCountedObject<Video> {
  public:
   DownscaledVideo(float scale_factor, const rtc::scoped_refptr<Video>& video)
       : downscaled_width_(
-            static_cast<int>(round(scale_factor * video->width()))),
+            static_cast<int>(std::round(scale_factor * video->width()))),
         downscaled_height_(
-            static_cast<int>(round(scale_factor * video->height()))),
+            static_cast<int>(std::round(scale_factor * video->height()))),
         video_(video) {}
 
   int width() const override { return downscaled_width_; }