--- a/dom/media/MediaManager.cpp
+++ b/dom/media/MediaManager.cpp
@@ -4220,17 +4220,17 @@ SourceListener::CapturingVideo() const
           Preferences::GetBool("media.navigator.permission.fake"));
 }
 
 bool
 SourceListener::CapturingAudio() const
 {
   MOZ_ASSERT(NS_IsMainThread());
   return Activated() && mAudioDeviceState && !mAudioDeviceState->mStopped &&
-         (mAudioDeviceState->mDevice->mSource->IsFake() ||
+         (!mAudioDeviceState->mDevice->mSource->IsFake() ||
           Preferences::GetBool("media.navigator.permission.fake"));
 }
 
 CaptureState
 SourceListener::CapturingSource(MediaSourceEnum aSource) const
 {
   MOZ_ASSERT(NS_IsMainThread());
   if ((!GetVideoDevice() || GetVideoDevice()->GetMediaSource() != aSource) &&