diff --git a/modules/audio_mixer/frame_combiner.cc b/modules/audio_mixer/frame_combiner.cc
index e31eea595f..abfc5e3ad9 100644
--- a/modules/audio_mixer/frame_combiner.cc
+++ b/modules/audio_mixer/frame_combiner.cc
@@ -98,9 +98,7 @@ void MixToFloatFrame(rtc::ArrayView<const AudioFrame* const> mix_list,
   RTC_DCHECK_LE(samples_per_channel, FrameCombiner::kMaximumChannelSize);
   RTC_DCHECK_LE(number_of_channels, FrameCombiner::kMaximumNumberOfChannels);
   // Clear the mixing buffer.
-  for (auto& one_channel_buffer : *mixing_buffer) {
-    std::fill(one_channel_buffer.begin(), one_channel_buffer.end(), 0.f);
-  }
+  *mixing_buffer = {};
 
   // Convert to FloatS16 and mix.
   for (size_t i = 0; i < mix_list.size(); ++i) {