diff --git a/webrtc/api/call/audio_state.h b/webrtc/api/call/audio_state.h
index 1941cbf7bc..b8dca3fb4e 100644
--- a/webrtc/api/call/audio_state.h
+++ b/webrtc/api/call/audio_state.h
@@ -16,7 +16,6 @@
 
 namespace webrtc {
 
-class AudioDeviceModule;
 class VoiceEngine;
 
 // WORK IN PROGRESS