diff --git a/sdk/objc/native/src/audio/audio_device_ios.mm b/sdk/objc/native/src/audio/audio_device_ios.mm
index cd5f32aa72..660edf7439 100644
--- a/sdk/objc/native/src/audio/audio_device_ios.mm
+++ b/sdk/objc/native/src/audio/audio_device_ios.mm
@@ -62,16 +62,6 @@
 const UInt16 kFixedPlayoutDelayEstimate = 30;
 const UInt16 kFixedRecordDelayEstimate = 30;
 
-enum AudioDeviceMessageType : uint32_t {
-  kMessageTypeInterruptionBegin,
-  kMessageTypeInterruptionEnd,
-  kMessageTypeValidRouteChange,
-  kMessageTypeCanPlayOrRecordChange,
-  kMessageTypePlayoutGlitchDetected,
-  kMessageOutputVolumeChange,
-  kMessageTypeAudioWillRecord,
-};
-
 using ios::CheckAndLogError;
 
 #if !defined(NDEBUG)