diff --git a/fftools/ffmpeg.h b/fftools/ffmpeg.h
index 27ef92654c..c461e93ff9 100644
--- a/fftools/ffmpeg.h
+++ b/fftools/ffmpeg.h
@@ -656,7 +656,6 @@ extern float audio_drift_threshold;
 extern float dts_delta_threshold;
 extern float dts_error_threshold;
 
-extern int audio_volume;
 extern int audio_sync_method;
 extern enum VideoSyncMethod video_sync_method;
 extern float frame_drop_threshold;