diff --git a/webrtc/api/audio/audio_mixer.h b/webrtc/api/audio/audio_mixer.h
index dbb58ca74a..931f20eaba 100644
--- a/webrtc/api/audio/audio_mixer.h
+++ b/webrtc/api/audio/audio_mixer.h
@@ -51,12 +51,13 @@ class AudioMixer : public rtc::RefCountInterface {
     virtual ~Source() {}
   };
 
-  // Returns true if adding/removing was successful. A source is never
-  // added twice and removal is never attempted if a source has not
-  // been successfully added to the mixer. Addition and removal can
-  // happen on different threads.
+  // Returns true if adding was successful. A source is never added
+  // twice. Addition and removal can happen on different threads.
   virtual bool AddSource(Source* audio_source) = 0;
-  virtual bool RemoveSource(Source* audio_source) = 0;
+
+  // Removal is never attempted if a source has not been successfully
+  // added to the mixer.
+  virtual void RemoveSource(Source* audio_source) = 0;
 
   // Performs mixing by asking registered audio sources for audio. The
   // mixed result is placed in the provided AudioFrame. This method
diff --git a/webrtc/modules/audio_mixer/audio_mixer_impl.cc b/webrtc/modules/audio_mixer/audio_mixer_impl.cc
index d7025f9e67..4bd96cd72f 100644
--- a/webrtc/modules/audio_mixer/audio_mixer_impl.cc
+++ b/webrtc/modules/audio_mixer/audio_mixer_impl.cc
@@ -280,13 +280,12 @@ bool AudioMixerImpl::AddSource(Source* audio_source) {
   return true;
 }
 
-bool AudioMixerImpl::RemoveSource(Source* audio_source) {
+void AudioMixerImpl::RemoveSource(Source* audio_source) {
   RTC_DCHECK(audio_source);
   rtc::CritScope lock(&crit_);
   const auto iter = FindSourceInList(audio_source, &audio_source_list_);
   RTC_DCHECK(iter != audio_source_list_.end()) << "Source not present in mixer";
   audio_source_list_.erase(iter);
-  return true;
 }
 
 AudioFrameList AudioMixerImpl::GetAudioFromSources() {
diff --git a/webrtc/modules/audio_mixer/audio_mixer_impl.h b/webrtc/modules/audio_mixer/audio_mixer_impl.h
index ec2989e554..af83367fc4 100644
--- a/webrtc/modules/audio_mixer/audio_mixer_impl.h
+++ b/webrtc/modules/audio_mixer/audio_mixer_impl.h
@@ -53,7 +53,7 @@ class AudioMixerImpl : public AudioMixer {
 
   // AudioMixer functions
   bool AddSource(Source* audio_source) override;
-  bool RemoveSource(Source* audio_source) override;
+  void RemoveSource(Source* audio_source) override;
 
   void Mix(size_t number_of_channels,
            AudioFrame* audio_frame_for_mixing) override LOCKS_EXCLUDED(crit_);