diff --git a/webrtc/modules/audio_coding/neteq/tools/audio_sink.h b/webrtc/modules/audio_coding/neteq/tools/audio_sink.h
index 6e159e657b..5743c3641d 100644
--- a/webrtc/modules/audio_coding/neteq/tools/audio_sink.h
+++ b/webrtc/modules/audio_coding/neteq/tools/audio_sink.h
@@ -22,7 +22,7 @@ namespace test {
 // applications.
 class AudioSink {
  public:
-  AudioSink();
+  AudioSink() {}
   virtual ~AudioSink() {}
 
   // Writes |num_samples| from |audio| to the AudioSink. Returns true if