diff --git a/libavfilter/af_volume.h b/libavfilter/af_volume.h
index c97902969e..c3756ee969 100644
--- a/libavfilter/af_volume.h
+++ b/libavfilter/af_volume.h
@@ -47,7 +47,9 @@ enum VolumeVarName {
     VAR_NB_CHANNELS,
     VAR_NB_CONSUMED_SAMPLES,
     VAR_NB_SAMPLES,
+#if FF_API_FRAME_PKT
     VAR_POS,
+#endif
     VAR_PTS,
     VAR_SAMPLE_RATE,
     VAR_STARTPTS,