1 files changed, 2 insertions, 0 deletions
diff --git a/src/mixer/MixerControl.hxx b/src/mixer/MixerControl.hxx
index 46a9138e6..75255d98c 100644
--- a/src/mixer/MixerControl.hxx
+++ b/src/mixer/MixerControl.hxx
@@ -30,10 +30,12 @@ class Mixer;
 class EventLoop;
 struct AudioOutput;
 struct MixerPlugin;
+class MixerListener;
 struct config_param;
 
 Mixer *
 mixer_new(EventLoop &event_loop, const MixerPlugin &plugin, AudioOutput &ao,
+	  MixerListener &listener,
 	  const config_param &param,
 	  Error &error);