diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
index 52b8265..38f453d 100644
--- a/Source/WebCore/ChangeLog
+++ b/Source/WebCore/ChangeLog
@@ -1,3 +1,16 @@
+2019-05-16  Youenn Fablet  <youenn@apple.com>
+
+        CoreAudioCaptureSource should be marked as an audio capture track
+        https://bugs.webkit.org/show_bug.cgi?id=197953
+        <rdar://problem/50552007>
+
+        Reviewed by Eric Carlson.
+
+        Manually tested.
+
+        * platform/mediastream/mac/CoreAudioCaptureSource.h:
+        Mark it as microphone so that it can get muted properly.
+
 2019-05-16  Alex Christensen  <achristensen@webkit.org>
 
         Add SPI to set a list of hosts to which to send custom header fields cross-origin
diff --git a/Source/WebCore/platform/mediastream/mac/CoreAudioCaptureSource.h b/Source/WebCore/platform/mediastream/mac/CoreAudioCaptureSource.h
index b3ea782..1ab816c 100644
--- a/Source/WebCore/platform/mediastream/mac/CoreAudioCaptureSource.h
+++ b/Source/WebCore/platform/mediastream/mac/CoreAudioCaptureSource.h
@@ -92,6 +92,7 @@
     void settingsDidChange(OptionSet<RealtimeMediaSourceSettings::Flag>) final;
 
     bool interrupted() const final;
+    CaptureDevice::DeviceType deviceType() const final { return CaptureDevice::DeviceType::Microphone; }
 
     void initializeToStartProducingData();